What Are the Secrets Behind the Carolina Bays Geological Phenomenon?

[Mat h physics]

Who may know some details about the Carolina Bays?

http://en.wikipedia.org/wiki/Carolina_bays

or other odd formation on the earth.

 

[Astronuc]

Who may know some details about the Carolina Bays?

http://en.wikipedia.org/wiki/Carolina_bays

or other odd formation on the earth.

In what information is one interested?

http://www.srel.edu/outreach/factsheet/carolinabays.html

http://www.epa.gov/owow/wetlands/pdf/CarolinaBays.pdf

http://www.carolinanow.com/recsites/carolinabays.htm

The bays are found from Delaware to Florida, with a concentration around N and S Carolina.

 

[Dotini]

The formed by falling bodies, was reasonable until learning how shallow they are. What do U believe to be a rational explanation?

Hi Mat,
It appears you would like to know the origin of Carolina Bays, which formed on Earth prior to the Holocene. The wikipedia entry you linked mentioned two broad categories of possible origin - that "these features were created by forces within the Earth, or that they were gouged by an astronomical event or set of events". The wiki entry concluded by rejecting the impact hypothesis, as you note. However, the geomorphology explanation runs into troubles, too, for instance the wiki reference to the spring sapping ideas of D.W. Johnson, "The Origin of the Carolina Bays" New York: Columbia University Press, is refuted as violating the conservation of energy, http://www.jstor.org/pss/30071107. So you do have a credible mystery here.

As an alternative, *Corliss cites the research of Y. Otsuki, physics professor of Waseda University, into plasmoids (to include plasma vortices), which hint at a sort of impact, not merely ballistic, following on from air bursts. For instance, a body disintegrates, say icy charged hailstones produced in the ionosphere, producing an ion trail to ground, resulting in something like lightning and its effects. In order to apply, these effects must have existed on scales larger than lightning effects known to occur now in the Holocene.

*"Science Frontiers: Some Anomalies and Curiosities of Nature", William R Corliss

Respectfully submitted,
Steve

 

[Astronuc]

Thank you for the links. Never heard the "dinosaur footprints" part before << post edited by Mentor >>

The formed by falling bodies, was reasonable until learning how shallow they are. What do U believe to be a rational explanation?

There is plenty of time for erosion and accumulation of organic matter. The fact that they fill with water means that rocks and minerals would be carried to the depressions and accumulate over time. Then vegetation would grow in the water or along the banks, and sooner or later die. Leaves from deciduous trees are shed annually, so they would accumulate in the water. Nor surprises there.

 

[Andre]

So I ran across this vid: http://www.youtube.com/watch?annotation_id=annotation_567977&v=1IrxFAFL-oc&feature=iv
It seems as though an event like that being replicated (w/ as sheet of ice) @ the 4min mark would make sense...

There are threads about that this for insance

http://www.pnas.org/content/early/2009/10/09/0907857106.full.pdf

As for the Carolina bays, there is no point in speculating. That has been done ad nauseum.

 

[Cintos]

Who may know some details about the Carolina Bays?

http://en.wikipedia.org/wiki/Carolina_bays

or other odd formation on the earth.

It has been well shown that the gentle depressions are unlikely to be impact structures, for many reasons - depth-to-diameter ratio being only one aspect. Douglas Johnson, in his 1942 tomb on the subject of "The Origin of the Carolina Bays" cited numerous additional reasons why his findings were not supportive of an impact mechanism. Among those is an observation that the sand in the rim and comprising the sheet of sand surrounding the bays has no direct relationship to the strata beneath the bays, nor are those strata disturbed by the presence of the overlying bay. Johnson also noted that antecedent drainage channels mapping through numerous bays seemed to have survived the creation of the bays, something that would be unlikely if they were carved out by impact processes.

You might get an interesting perspective by viewing the bays in high-resolution LiDAR-generated digital elevation maps.
- Michael

 

[DoggerDan]

Are they odd? Similar features are found throughout the world in low-lying coastal areas. Louisiana's swamps are very similar.

 

[Cintos]

Are they odd? Similar features are found throughout the world in low-lying coastal areas. Louisiana's swamps are very similar.

The "Citronella" ponds in LA have been mentioned in listings of CB-like structures in the US. I have not identified any publicly available LiDAR in those areas of LA to inspect for the robustness of planform shape seen in further east.

Oriented lakes in the Siberian Arctic have a similar presentation to those in Alaska and the NWT, and oriented oval lake collections have been reported in South Africa, Australia and Argentina. The creation of similar structures right along coastlines (see attached from Siberia) seem the most similar to Carolina bays in shape - geometrically pure shapes. The shoreline process was discussed by Cooke in 1934, where he proposed Atlantic shoreline lagoons morph into chains of lakes. I find it quite persuasive, as did many others back in the 30's and 40's. As the identification of Carolina bays continued inland and into higher elevations, it lost favor. Today, bays are found on a continuum up to 200m elevation in the Carolinas, and the Atlantic has not visited those areas for over a million years.

Douglas Johnson, in his 1942 book on the bays, made a statement that has been a guiding principle for me:

No one has yet invented an explanation which will fully account for all the facts observed.

Billings, Siberia, Russia from Google Earth

 

[DrClapeyron]

Carolina Bays -Salt Tectonics?

Is there any debate on whether these structures could be the reslt of salt tectonics? I did a google search for the Carolina Bays and any drilling activity, but a first search did not reveal anything significant. You think it would be easy enough to run a siesmic survey to see if there are any unusual changes in velocity, and try to correlate this to salt tectonic induced faulting. Or to run a gravity survey to detect any anomolies that could represent a bulb or stock or any sort of diaper, but there is not much available through simple google searches.

Oil and mineral companies must not fund a whole lot of research into finding what is below the Carolina Bays, which are present from Deleware to Georgia. I am not 100% convinced about the impact theory without some real hard evidence to show that these bays are not salt tectonic structures, or soft-sediment deformation structures caused by a massive earthquake as a result of forces between the down going oceanic crust and the floating North American crust.

 

[DrClapeyron]

I walked into the discount bookstore the otherday and found myself a like-new copy of the Roadside Geology to South Dakota. I never had much interest in glaciation, I bought the book to read about the Blackhills, however, looking at aerial photos and topo maps of glacial lakes/outwash I began to question my previous thoughts on the Carolina Bays.

While imagining how these small lakes would form, a thought popped into my head: maybe the bays are area that small glaciers deformed the ground where small glaciers once sat. Perhaps the glaciation east of the Appalachians was less mature than what happened between the Appalachians and the Rockies. This would explain why there aren't eratics or moraines present in the area.

So after doing a quick google search I found (and had suspected that hopefully) someone had beaten me to it.

http://www.evolutionaryleaps.com/Reader_thinks_Carolina_Bays_have_glacial_origin.htm

Here is my explanation for why the Carolina bays are oval and oriented all in the same general direction, and why I think they have a glacial origin:

Glacial Kettles are formed by large blocks of relatively sediment-free(clearer) ice being carried along in an ice-mass that is more uniformly sediment laden (gravels, glacial till). When the ice-mass finally melts, it does not always melt at once, nor at the same rate. The motion of the whole ice-mass accounts for the oval shape of the bays. In areas where kettle lakes are more round than oval, one can assume that the containing ice-mass was in relative stasis, i.e.: not in motion when melting occurred.

If this idea has any merit to it takes away a lot of the luster of an impact origin, and should raise the issue of a sort of mutual evolution of the bays through both glacial cycles and hydrological cycles.

 

[Studiot]

I wonder if there is any connection to pingo landscapes.

http://www.google.co.uk/search?q=pi...v&sa=X&ei=fWFNTtX2OsaWhQegzLX6Bg&ved=0CFcQsAQ

Remenent pingos can be found in S Ireland.

 

[Andre]

It has been considered here, but

A pingo-scar hypothesis was rejected because the topographic and hydrological conditions are lacking and water depths were insufficient to form pingo-scars

 

[DrClapeyron]

Thank you for the information Andre. I had to crack open my books to relearn some of these concepts like skewness.

Until the recent East Coast earthquake I was unaware that earthquakes could be felt so far away from their epicenter. This is because East Coast rocks are not deformed to the point where they have been brecciated and heavily fractured. So they are extremely good conductors, they do not absorb kinetic energy as well as their West Coast brethren.

Taking this information into account and some of the stories from the New Madrid earthquake of 1811 (sand volcanoes) I think earthquake induced soft sediment deformation leading to the formation of the Carolina Bays should be taken into question. Maybe this has something to do with the artesian wells theory, could you help me out Andre?


Could a large earthquake 12,000 years ago have liquefacted underlying water laden sediments to form plumes leading to the formation of the Carolina Bays? I have seen truck-size ball and pillow structures but I admitt to never having seen such structures close to the size or extent of the Carolina Bays.

 

[Cintos]

Greetings: There were significant sightings of sand volcanoes (sand blows) in the Charleston vicinity after the 1886 quake. The concept is quite intriguing, when consideration is given to quakes substantially stronger over the last 200,000 years. Have a look at this page:http://tehrkotmedia.photoshelter.com/image/I0000429nRvEv_w8 for a photo of a fresh blow in South Carolina.

If earthquakes were involved, the timing constraint dictated by the lack of bay landforms on sandy surfaces created over the last 150,000 years remains, such as the Wando surface (see Soller, USGS Professional paper 1466-A, 1988). i.e., no "Carolina Bays" were created in 1886.

The Carolina bay landforms in the Midlothian, VA, area, are sandy-rimed oval landforms resting on a gravel base. The local geology there would not support a sand blow geomorphology. Also challenging for a sand blow genesis are bays measuring over a few tens of meters across - of which there are significant quantities.

- Michael

 

[betzalel]

The Firestone Younger Dryas paper alleges there is evidence of high temperature residue at the Carolina Bay elliptical marks which is similar to the high temperature residue that has found throughout the Northern Hemisphere that coincides in time with the occurrence of the Younger Dryas.

The Firestone paper hypotheses that the Younger Dryas high temperature marks were caused by a comet that broke up and then struck the planet in multiple locations throughout the northern hemisphere. The comet hypothesis does not explain how the Younger Dryas event caused abrupt cooling of the planet for a 1000 years. (An impact event would cool the planet for 3 to 5 years, due to dust and sulfur dioxide after which it would return to warming.)

As noted the Carolina Bay elliptical marks are significantly older (30,000 years to 60,000 years before present) than the Younger Dryas abrupt cooling event (the Younger Dryas event occurred 12,800 years before present.) There are roughly 1/2 million Carolina Bay marks. A comet could not cause 1/2 million marks on the planet.

In the last 10 years, geomagnetic specialists have found evidence of cyclic geomagnetic excursions (during a geomagnetic excursion the geomagnetic field develops multiple poles and the field intensity drops by a factor of 3 to 10). A geomagnetic excursion is capable of abruptly cooling the planet by Svensmark's mechanism. (The cooling pattern during an excursion is complicated as there are multiple poles formed which causes both increases and decreases in galactic cosmic rays (GCR) depending on the location of new temporary pole.)

There are geomagnetic excursions at the termination of the past interglacial periods and at the Younger Dryas.

The Carolina marks are overlapping, elliptical, with an axis that is alligned in the North west direction.

Carolina Bays. The Carolina Bays are a group of »500,000 highly elliptical and often overlapping depressions scattered throughout the Atlantic Coastal Plain from New Jersey to Alabama (see SI Fig. 7). They range from ≈50 m to ≈10 km in length (10) and are up to ≈15 m deep with their parallel long axes oriented predominately to the northwest. The Bays have poorly stratified, sandy, elevated rims (up to 7 m) that often are higher to the southeast. All of the Bay rims examined were found to have, throughout their entire 1.5- to 5-m sandy rims, a typical assemblage of YDB markers (magnetic grains, magnetic microspherules, Ir, charcoal, soot, glass-like carbon, nanodiamonds, carbon spherules, and fullerenes with 3He). …

http://www.pnas.org/content/104/41/16016/suppl/DC1#F7

Quote:

Fig. 7. Aerial photo (U.S. Geological Survey) of a cluster of elliptical and often overlapping Carolina Bays with raised rims in Bladen County, North Carolina. …
…The largest Bays are several kilometers in length, and the overlapping cluster of them in the center is ≈8 km long.

Is the geodynamo process intrinsically unstable?

http://eprints.whiterose.ac.uk/416/

Recent palaeomagnetic studies suggest that excursions of the geomagnetic field, during which the intensity drops suddenly by a factor of 5 to10 and the local direction changes dramatically, are more common than previously expected. The `normal' state of the geomagnetic field, dominated by an axial dipole, seems to be interrupted every 30 to 100 kyr; it may not therefore be as stable as we thought.


Recent studies suggest that the Earth's magnetic field has fallen dramatically in magnitude and changed direction repeatedly since the last reversal 700 kyr ago (Langereis et al. 1997; Lund et al. 1998). These important results paint a rather different picture of the long-term behaviour of the field from the conventional one of a steady dipole reversing at random intervals: instead, the field appears to spend up to 20 per cent of its time in a weak, non-dipole state (Lund et al. 1998).

 

[Dotini]

In the last 10 years, geomagnetic specialists have found evidence of cyclic geomagnetic excursions (during a geomagnetic excursion the geomagnetic field develops multiple poles and the field intensity drops by a factor of 3 to 10). A geomagnetic excursion is capable of abruptly cooling the planet by Svensmark's mechanism. (The cooling pattern during an excursion is complicated as there are multiple poles formed which causes both increases and decreases in galactic cosmic rays (GCR) depending on the location of new temporary pole.)

There are geomagnetic excursions at the termination of the past interglacial periods and at the Younger Dryas.

The Carolina marks are overlapping, elliptical, with an axis that is alligned in the North west direction.

http://www.pnas.org/content/104/41/16016/suppl/DC1#F7

Quote:

Is the geodynamo process intrinsically unstable?

http://eprints.whiterose.ac.uk/416/

Thank you for a very interesting post.

I agree that a reduction of the geomagnetic field could cause cooling via the Svensmark mechanism. But I'm not the sharpest tool in box, and fail to see the connection to Carolina Bays. Could you be bit more explicit about this, please?

Respectfully yours,
Steve

 

[Andre]

Thank you for a very interesting post.

I agree that a reduction of the geomagnetic field could cause cooling via the Svensmark mechanism. But I'm not the sharpest tool in box, and fail to see the connection to Carolina Bays. Could you be bit more explicit about this, please?

Respectfully yours,
Steve

Earlier research did not find any corrolation between paleo magnetic excursions and general atmospheric conditions.

 

[betzalel]

Hi Steve,
Rather than starting with a conclusion and presenting the mechanism it is likely more effective to present the suite of observational anomalies and then present the mechanism. (i.e. The observational anomalies should logically support the mechanism.) It is seems that there are a suite of observational anomalies in three separate scientific fields that can be used to support the existence of a new mechanism.

As the Firestone paper noted there is high temperature residue at multiple locations in both North America and Europe that coincides in time with the Younger Dryas abrupt cooling period (12,900 years before present). The Firestone researchers did not look for other observational evidence before formulating their hypothesis that an extraterrestrial impact caused the multiple burn marks on the planet’s surface.

http://www.pnas.org/content/104/41/16016/suppl/DC1#F7

The next two papers provide additional observational evidence that there is a cyclic event that abruptly changes the geomagnetic field and depending on the location of the strike can also cause volcanic activity.

Monogenetic volcanoes do not share the same magma chamber and hence would not be expected to erupt at the same time. The fact that the five monogenetic volcanoes erupt at the same time and that they coincidentally capture the once in 30,000 to 100,000 year geomagnetic excursion supports the hypothesis that the physical cause of the geomagnetic excursion and the simultaneous eruptions is the same.

http://www.agu.org/pubs/crossref/2006/2006GL027284.shtml

Five monogenetic volcanoes within the Quaternary Auckland volcanic field are shown to have recorded a virtually identical but anomalous paleomagnetic direction (mean inclination and declination of 61.7° and 351.0°, respectively), consistent with the capture of a geomagnetic excursion. Based on documented rates of change of paleomagnetic field direction during excursions this implies that the volcanoes may have all formed within a period of only 50–100 years or less. These temporally linked volcanoes are widespread throughout the field and appear not to be structurally related. However, the general paradigm for the reawakening of monogenetic fields is that only a single new volcano or group of closely spaced vents is created, typically at intervals of several hundred years or more.

The paper these researchers are discussing concerns archeomagnetic jerks. Archeomagnetic jerk is the term specialists have given to an abrupt 10 to 15 degree change in the inclination of the geomagnetic field. The jerk was found by analyzing ancient fired pottery such as tiles or sundials. The pottery is heated above the Curie temperature and hence when it cools captures the direction and field intensity of the geomagnetic field when it cools. The ancient tiles have the date and kiln owner written on the back of the tiles. The archeomagnetic jerks occur with a periodicity of roughly 400 years.

http://geosci.uchicago.edu/~rtp1/BardPapers/responseCourtillotEPSL07.pdf

Also, we wish to recall that evidence of a correlation between archeomagnetic jerks and cooling events (in a region extending from the eastern North Atlantic to the Middle East) now covers a period of 5 millenia and involves 10 events (see f.i. Figure 1 of Gallet and Genevey, 2007). The climatic record uses a combination of results from Bond et al (2001), history of Swiss glaciers (Holzhauser et al, 2005) and historical accounts reviewed by Le Roy Ladurie (2004). Recent high-resolution paleomagnetic records (e.g. Snowball and Sandgren, 2004; St-Onge et al., 2003) and global geomagnetic field modeling (Korte and Constable, 2006) support the idea that part of the centennial-scale fluctuations in 14C production may have been influenced by previously unmodeled rapid dipole field variations. In any case, the relationship between climate, the Sun and the geomagnetic field could be more complex than previously imagined. And the previous points allow the possibility for some connection between the geomagnetic field and climate over these time scales.

So there is evidence of burn marks on the surface of the earth, cyclic significant changes to the geomagnetic field (archeomagnetic jerks), and cyclic very large geomagnetic changes -geomagnetic excursions.

There are a couple of dozen additional geophysical papers that provide additional support for the assertion that something is forcing the geomagnetic field and that what forces the geomagnetic field occasionally causes volcanic eruptions. The geophysical papers in question are interesting in that they support the assertion that there is a cyclic forcing event but do not help with understanding the fundamental mechanism.

The Researchers in the above paper speculate that a solar process could be the physical cause of the geomagnetic anomalies. The next step is to look for astronomical observations to see if there is support for a hypothesis that there is a cyclic solar change that is causing the geomagnetic changes and to see if the observations can be used to define the mechanism.

If you are interested I can outline the next set of observations in the astrophysics section of this forum, later this year.

 

[betzalel]

Hi Andre,

The paper you quote was written in 1997 which is prior to the discovery of and confirmation that there are archeomagnetic jerks. Below is a paper that notes there is a 100k year pseudo cycle in the geomagnetic field intensity. There is also a pseudo 41 k year cycle in the geomagnetic field. Other researchers have, however, noted that the orbital parameters are not not physically capable of causing sufficient changes to the liquid core to cause the “geomagnetic dynamo” to initiate an excursion or to cause an increase the geomagnetic field intensity. Another theory proposed to explain the geomagnetic excursions conceding with the termination of the interglacial period is ice sheet build up cause a geomagnetic excursion and ice sheet melting causes changes to the "dynamo" to increase the intensity of the geomagnetic field. That hypothesis fails as the geomagnetic intensity increases thousands of years before the ice sheet melting and as others have noted the geomagnetic excursion occurs at the termination of the interglacial period prior to the ice sheet build up. (The ice sheet affecting dynamo hypothesis does not explain the Younger Dryas period which occurred during the initiation of the interglacial period.) There is a problem with cause and effect.

Archeomagnetic jerks are likely not caused by orbital parameters affecting the “geomagnetic dynamo”. (the archeomagnetic jerks are too rapid and too frequent). The archeomagnetic jerks appear to be a paradox, something that cannot be explained by the assumed mechanism. There is evidence of burn marks on the surface of the earth. The burn marks have been dated to 12900 years which coincides with the Younger Dryas abrupt climate event. There is evidence of a geomagnetic excursion at the time of the Younger Dryas and at the termination of glacial periods and interglacial periods.

http://www.pnas.org/content/104/41/16016/suppl/DC1#F7

I have as noted above been looking through astronomical papers looking for observational evidence to explain what is observed. What I have found appear to be interesting. I will take a crack at presenting the astronomical observations late this year.

At this time, I have not further comments concerning the geomagnetic field or the burn marks.

http://www.geo.uu.nl/~forth/people/Hirokuni/Hiro2002a.pdf

Orbital Influence on Earth’s Magnetic Field: 100,000-Year Periodicity in Inclination

A continuous record of the inclination and intensity of Earth’s magnetic field, during the past 2.25 million years, was obtained from a marine sediment core of 42 meters in length. This record reveals the presence of 100,000-year periodicity in inclination and intensity, which suggests that the magnetic field is modulated by orbital eccentricity. The correlation between inclination and intensity shifted from antiphase to in-phase, corresponding to a magnetic polarity change from reversed to normal. To explain the observation, we propose a model in which the strength of the geocentric axial dipole field varies with 100,000-year periodicity, whereas persistent nondipole components do not.

 

[Andre]

Other researchers have, however, noted that the orbital parameters are not not physically capable of causing sufficient changes to the liquid core to cause the “geomagnetic dynamo” to initiate an excursion or to cause an increase the geomagnetic field intensity.

Thanks, I have to read up on my paleomagnetics, I see. We're quite of thread now away from the Carolina bays, but on the excursions maybe google Gary Glatzmaier

 

[Andre]

A new study about the Carolina bays.

Rodriguez et al, 2012; Burning peat and reworking loess contribute to the formation and evolution of a large Carolina-bay basin, Quaternary Research 77 (2012) 171–181 doi:10.1016/j.yqres.2011.11.004

Abstract

Carolina bays are nearly ubiquitous along ~1300 km of the North American Atlantic Coastal Plain, but relatively few bays have been examined in detail, making their formation and evolution a topic of controversy. The Lake Mattamuskeet basin, eastern North Carolina, USA, is a conglomeration of multiple Carolina bays that form a >162 km2 lake. The eastern shoreline of the lake is made up of a 2.9-km-wide plain of parabolic ridges that recorded rapid shoreface progradation. The lower shoreface deposit contains abundant charcoal beds and laminae dated 6465–6863 cal yr BP, corresponding with initiation of a lacustrine environment in the eastern part of the lake. A core from the western part of the lake sampled a 1541–1633 cal yr BP charcoal bed at the base of the lacustrine unit, indicating formation of this part of the basin postdates the eastern basin. Lake Mattamuskeet has no relationship to the Younger Dryas or a linked impact event because rim accretion significantly postdates 12,000 cal yr BP. The shoreline progradation, and association of charcoal beds with the oldest lake sediment in both main parts of the basin, suggest that fire and subsequent hydrodynamic processes were associated with initial formation of these Carolina bays.

Maybe I should work at a translation.

Anyway, that should deal with some wild speculations. However it should also raise new questions as they also find Pleistocene coastal–marine deposit, with shells beyond carbon dating (>40,000 years). Would that raise questions about sealevels during the ice age, not being so low?

 

[Cintos]

Greetings Andre:

The surface deposits all along the eastern US coastal plain are quite intriguing in their stratigraphy. The sea levels at present are similar to those seen at the termination of the Wisconsin Glaciation. However, the Illinoian Glaciation was both more extensive in glacial cover, as well as in the resulting much higher post-melt sea level. The coastal-marine deposits seen across the Lake Mattamuskeet basin are there because the entire Albemarle/Pamlico Peninsula was likely submerged at 80ka, as noted in the QR paper. Heck, if the coast continues to sink due to retreat of the LGM glacial-isostatic forebulge, it will be back under the Atlantic again in another few thousand years.

If only I could get comfortable with the author's assertion that the Carolina bays are being developed across this landscape. Seems to me they are simply being inundated and buried, similar to those along the Chesapeake shoreline of Virginia's Eastern Shore.

- Michael

 

[Andre]

... The coastal-marine deposits seen across the Lake Mattamuskeet basin are there because the entire Albemarle/Pamlico Peninsula was likely submerged at 80ka, as noted in the QR paper.

Thanks Michael, that part reminded me about http://geology.gsapubs.org/content/30/4/379.abstract. Beijing was also inundated at that time frame. No explanation given. I'd have to recheck the extend of the early and mid Weichselian glaciation extend in Siberia, but I'm pretty sure it stayed far away from Beijing.

Update: In a recent publication the early Weichselian glaciation is shown (fig 1, page 241). It doesn't get closer to Beijing than the Putorana mountains, central north Siberia.

So if these sea levels rises combined suggest a more eustatic character, how about the sea levels recorded in the marine isotopes?

http://geology.uprm.edu/Morelock/patterns.htm

I think I keep my signature below VVV a bit longer.