A bit of confusion here over different threads. Herewith:
These are three peer-reviewed journal articles that will be of interest on the matter of bluestone quarrying and the "interpretative inflation" seen in the bluestone research:
John, B.S., Elis-Gruffydd, D. & Downes, J. 2015b. Observations on the supposed “Neolithic Bluestone Quarry” at Craig Rhosyfelin, Pembrokeshire. Archaeology in Wales 54, pp 139-148. (December 2015)
https://www.researchgate.net/publication/286775899_OBSERVATIONS_ON_THE_SUPPOSED_NEOLITHIC_BLUESTONE_QUARRY_AT_CRAIG_RHOSYFELIN_PEMBROKESHIRE
Barclay, G. J., and K. Brophy. 2020. “‘A Veritable Chauvinism of Prehistory’: Nationalist Prehistories and the ‘British’ Late Neolithic Mythos.” Archaeological Journal 1–31.
doi:10.1080/00665983.2020.1769399
Brian John, Dyfed Elis-Gruffydd and John Downes (2015a). "Quaternary Events at Craig Rhosyfelin, Pembrokeshire." Quaternary Newsletter, October 2015 (No 137), pp 16-32.
https://www.blogger.com/Press%20Notice%2010th%20November%202015%20%20===================%20New%20research%20undermines%20Welsh%20Bluestone%20Quarry%20theory%20========================%20%20Research%20published%20today%20in%20the%20peer-reviewed%20journal%20%22Quaternary%20Newsletter%22%20throws%20serious%20doubt%20on%20claims%20that%20there%20is%20a%20Neolithic%20%22bluestone%20quarry%22%20at%20Craig%20Rhosyfelin%20in%20Pembrokeshire.%20%20Since%202011%20archaeologist%20Prof%20Mike%20Parker%20Pearson%20and%20his%20colleagues%20have%20conducted%20annual%20summer%20digs%20at%20the%20site,%20not%20far%20from%20the%20village%20of%20Brynberian,%20and%20they%20have%20promoted%20the%20idea%20that%20some%20of%20the%20rhyolite%20bluestones%20at%20Stonehenge%20were%20quarried%20here%20and%20then%20carried%20all%20the%20way%20to%20Stonehenge%20by%20Neolithic%20tribesmen%20about%205,000%20years%20ago.%20%20In%202012%20Parker%20Pearson%20referred%20to%20the%20site%20as%20%22the%20Pompeii%20of%20prehistoric%20stone%20quarries.%22%20%20His%20theory%20arose%20from%20some%20very%20precise%20%22provenancing%22%20by%20geologists%20Richard%20Bevins%20and%20Rob%20Ixer,%20who%20discovered%20that%20some%20of%20the%20fragments%20of%20rock%20in%20the%20soil%20layers%20in%20and%20around%20Stonehenge%20could%20be%20matched%20closely%20to%20a%20flinty%20blue%20rhyolite%20rock%20exposed%20in%20a%20crag%20at%20Rhosyfelin.%20%20The%20archaeologists%20also%20discovered%20an%20eight-tonne%20elongated%20slab%20of%20rhyolite%20not%20far%20from%20the%20Rhosyfelin%20rock%20face,%20which%20they%20assumed%20had%20been%20quarried%20and%20then%20somehow%20left%20behind.%20%20Many%20tonnes%20of%20sediments%20have%20subsequently%20been%20removed%20by%20the%20archaeologists%20in%20their%20hunt%20for%20quarrying%20traces.%20%20Now%20geologist%20John%20Downes%20and%20geomorphologists%20Dyfed%20Elis-Gruffydd%20and%20Brian%20John%20have%20examined%20the%20site%20very%20carefully,%20and%20have%20come%20to%20the%20conclusion%20that%20there%20are%20no%20traces%20of%20a%20Neolithic%20quarry%20here.%20%20Instead,%20they%20interpret%20the%20rocky%20debris%20found%20during%20the%20archaeological%20dig%20as%20entirely%20natural%20accumulations%20resulting%20from%20intermittent%20rockfalls%20over%20a%20long%20period%20of%20time.%20%20In%20their%20new%20article%20they%20also%20describe%20a%20number%20of%20different%20landforms%20and%20sediments%20which%20can%20be%20related%20to%20the%20events%20of%20the%20Ice%20Age%20--%20and%20in%20particular%20to%20the%20last%20glaciation%20of%20this%20area%20which%20occurred%20around%2020,000%20years%20ago.%20%20They%20accept%20that%20there%20might%20have%20been%20a%20prehistoric%20camp%20site%20in%20the%20sheltered%20valley%20at%20the%20foot%20of%20the%20Rhosyfelin%20rocky%20crag,%20but%20they%20suggest%20that%20it%20was%20used%20by%20hunters%20rather%20than%20by%20quarrymen.%20%20Back%20to%20the%20glacial%20transport%20theory...%20%20Speaking%20about%20the%20new%20study,%20researcher%20Dr%20Brian%20John%20said:%20%20%22We%20have%20no%20argument%20with%20the%20geological%20work%20that%20links%20this%20site%20with%20Stonehenge.%20%20But%20we%20cannot%20accept%20the%20idea%20of%20a%20Neolithic%20quarry%20here%20without%20firm%20evidence%20--%20and%20in%20our%20considered%20opinion%20there%20is%20none.%20%20The%20features%20referred%20to%20by%20the%20archaeologists%20as%20evidence%20of%20human%20quarrying%20activity%20%28pivots,%20props,%20scratches,%20%22railway%20lines%22,%20hammer%20stones,%20platforms,%20revetments%20and%20so%20forth%29%20are%20entirely%20natural.%20%20There%20are%20no%20artefacts,%20bones%20or%20tools.%20%20We%20are%20also%20increasingly%20convinced%20that%20the%20rhyolite%20debris%20at%20Stonehenge%20comes%20from%20glacial%20erratics%20which%20were%20eroded%20from%20the%20Rhosyfelin%20rocky%20crag%20almost%20half%20a%20million%20years%20ago%20by%20the%20overriding%20Irish%20Sea%20Glacier%20%28Britain%27s%20biggest%20ever%20glacier%29%20and%20then%20transported%20eastwards%20by%20ice%20towards%20Salisbury%20Plain.%20%20Glaciologically%20that%20was%20perfectly%20possible,%20if%20not%20probable.%20%20We%20are%20confident%20that%20radiocarbon%20and%20other%20dating%20in%20the%20future%20will%20confirm%20the%20falsehood%20of%20the%20Neolithic%20quarry%20theory%20and%20the%20essential%20reliability%20of%20the%20glacial%20transport%20theory.%22%20%20ENDS%20%20Brian%20John,%20Dyfed%20Elis-Gruffydd%20and%20John%20Downes%20%282015a%29.%20%20%22Quaternary%20Events%20at%20Craig%20Rhosyfelin,%20Pembrokeshire.%22%20%20Quaternary%20Newsletter,%20October%202015%20%28No%20137%29,%20pp%2016-32.%20https://www.researchgate.net/publication/283643851_QUATERNARY_EVENTS_AT_CRAIG_RHOSYFELIN_PEMBROKESHIRE%20%20https://www.academia.edu/19788792/Quaternary_Events_at_Craig_Rhosyfelin_Pembrokeshire%20%20Contact:%20Dr%20Brian%20John%20Tel:%2001239-820470%20%20==================%20%20Press%20Notice%20Monday%2014th%20December%202015%20%20=====================%20%22Bluestone%20quarry%22%20archaeologists%20are%20accused%20of%20creating%20their%20own%20evidence%20===========================%20%20Earth%20scientists%20who%20have%20worked%20at%20a%20%22bluestone%20monolith%20quarry%22%20site%20at%20Craig%20Rhosyfelin%20in%20Pembrokeshire%20have%20suggested%20that%20the%20archaeologists%20have%20got%20it%20all%20wrong,%20and%20that%20%20the%20so-called%20%22engineering%20features%22%20on%20the%20flank%20of%20the%20crag%20are%20entirely%20natural.%20%20Further,%20it%20is%20suggested%20that%20members%20of%20the%20digging%20team%20have%20unconsciously%20created%20the%20very%20features%20that%20they%20have%20cited%20in%20support%20of%20their%20quarrying%20hypothesis.%20%20In%20a%20peer-reviewed%20paper%20published%20today%20in%20%22Archaeology%20in%20Wales%22%20journal%20%281%29%20%20Dr%20Brian%20John,%20Dr%20Dyfed%20Elis-Gruffydd%20and%20John%20Downes%20have%20described%20a%20set%20of%20%20Ice%20Age%20deposits%20and%20landforms%20at%20the%20site%20of%20an%20archaeological%20dig%20that%20was%20started%20in%202011,%20and%20have%20determined%20that%20there%20are%20no%20traces%20of%20human%20intervention%20in%20any%20of%20the%20features%20that%20have%20made%20the%20archaeologists%20so%20excited%20%282%29.%20%20These%20include%20features%20described%20by%20the%20diggers%20as%20a%20quarry%20face,%20a%20quarry%20spoil%20bank,%20a%20storage%20platform,%20props%20and%20pillars,%20stone%20rails,%20a%20%22proto-orthostat%22,%20a%20revetment,%20and%20an%20export%20pathway.%20%20Most%20of%20these%20are%20now%20dismissed%20as%20%22archaeological%20artifices%22%20unconsciously%20created%20by%20the%20archaeologists%20themselves%20during%20five%20years%20of%20highly%20selective%20sediment%20removal.%20In%20other%20words,%20the%20authors%20of%20the%20new%20article%20suggest%20that%20the%20%20archaeologists%20have%20created%20what%20they%20wanted%20to%20find,%20instead%20of%20describing%20what%20was%20there%20%283%29.%20%20This%20site%20has%20been%20described%20by%20lead%20archaeologist%20Prof%20Mike%20Parker%20Pearson%20as%20%22the%20Pompeii%20of%20prehistoric%20stone%20quarries%22%20and%20has%20caused%20great%20excitement%20in%20archaeological%20circles.%20%20The%20selection%20of%20this%20rocky%20crag%20near%20the%20village%20of%20Brynberian%20for%20excavation%20in%202011-%202015%20was%20triggered%20by%20the%20discovery%20by%20geologists%20Richard%20Bevins%20and%20Rob%20Ixer%20that%20some%20of%20the%20stone%20fragments%20in%20the%20soil%20at%20Stonehenge%20were%20quite%20precisely%20matched%20to%20an%20unusual%20type%20of%20foliated%20rhyolite%20found%20in%20the%20crag.%20%20This%20led%20the%20archaeologists%20to%20conclude%20that%20there%20must%20have%20been%20a%20Neolithic%20quarry%20here,%20worked%20for%20the%20specific%20purpose%20of%20cutting%20out%20monoliths%20for%20the%20bluestone%20settings%20at%20Stonehenge.%20%20Commenting%20on%20the%20new%20research%20paper,%20Dr%20Brian%20John%20says:%20%20%22The%20new%20geological%20work%20at%20Rhosyfelin%20and%20Stonehenge%20is%20an%20interesting%20piece%20of%20%22rock%20provenencing%22%20--%20but%20it%20tells%20us%20nothing%20at%20all%20about%20how%20monoliths%20or%20smaller%20rock%20fragments%20from%20West%20Wales%20found%20their%20way%20to%20Stonehenge.%20%20We%20are%20sure%20that%20the%20archaeologists%20have%20convinced%20themselves%20that%20the%20glacial%20transport%20of%20erratics%20was%20impossible.%20%20We%20are%20not%20sure%20where%20they%20got%20that%20idea%20from.%20%20On%20the%20contrary,%20there%20is%20substantial%20evidence%20in%20favour%20of%20glacial%20transport%20and%20zero%20evidence%20in%20support%20of%20the%20human%20transport%20theory.%20%20We%20accept%20that%20there%20might%20have%20been%20a%20camp%20site%20at%20Rhosyfelin,%20used%20intermittently%20by%20hunters%20over%20several%20millennia.%20%20But%20there%20is%20no%20quarry.%20%20We%20think%20the%20archaeologists%20have%20been%20so%20keen%20on%20telling%20a%20good%20story%20here%20that%20they%20have%20ignored%20or%20misinterpreted%20the%20evidence%20in%20front%20of%20them.%20%20That%27s%20very%20careless.%20%20They%20now%20need%20to%20undertake%20a%20complete%20reassessment%20of%20the%20material%20they%20have%20collected.%22%20%20The%20three%20authors%20of%20the%20new%20paper%20suggest%20that%20this%20fundamental%20error%20in%20interpretation%20might%20have%20been%20avoided%20if%20there%20had%20been%20greater%20cooperation%20in%20the%20Rhosyfelin%20dig%20between%20archaeologists%20and%20specialists%20from%20related%20disciplines.%20%20%20ENDS%20%20Notes:%20%20%20%20%281%29%20%20The%20article%20reference%20is%20as%20follows:%20Brian%20John,%20Dyfed%20Elis-Gruffydd%20and%20John%20Downes.%20%202015.%20OBSERVATIONS%20ON%20THE%20SUPPOSED%20%E2%80%9CNEOLITHIC%20BLUESTONE%20QUARRY%E2%80%9D%20AT%20CRAIG%20RHOSYFELIN,%20PEMBROKESHIRE%22.%20%20Archaeology%20in%20Wales%2054,%20pp%20139-148.%20%28Publication%2014th%20December%202015%29%20https://www.academia.edu/19788912/Observations_on_the_supposed_Neolithic_Bluestone_Quarry_at_Craig_Rhosyfelin_Pembrokeshire%20%20%20%20%282%29%20%20Mike%20Parker%20Pearson,%20Richard%20Bevins,%20Rob%20Ixer,%20Joshua%20Pollard,%20Colin%20Richards,%20Kate%20Welham,%20Ben%20Chan,%20Kevan%20Edinborough,%20Derek%20Hamilton,%20Richard%20Macphail,%20Duncan%20Schlee,%20Jean-Luc%20Schwenninger,%20Ellen%20Simmons%20and%20Martin%20Smith%20%282015%29.%20Craig%20Rhos-y-felin:%20a%20Welsh%20bluestone%20megalith%20quarry%20for%20Stonehenge.%20%20%20Antiquity,%2089%20%28348%29%20%28Dec%202015%29,%20pp%201331-1352.%20http://www.ucl.ac.uk/news/news-articles/1215/071215-stonehenge-bluestone-quarries%20%20%20%283%29%20%20Quote%20from%20the%20Conclusions%20of%20the%20new%20paper:%20%20%22It%20is%20suggested,%20on%20the%20basis%20of%20careful%20examinations%20of%20this%20site,%20that%20certain%20of%20the%20%E2%80%9Cman%20made%20features%E2%80%9D%20described%20have%20been%20created%20by%20the%20archaeologists%20themselves%20through%20a%20process%20of%20selective%20sediment%20and%20clast%20removal.%20An%20expectation%20or%20conviction%20that%20%E2%80%9Cengineering%20features%E2%80%9D%20would%20be%20found%20has%20perhaps%20led%20to%20the%20unconscious%20fashioning%20of%20archaeological%20artifices.%22%20%20Contact:%20%20Dr%20Brian%20John%20Tel:%2001239-820470%20brianjohn4@mac.com