What Type of Rock is This Odd Beach Find from Northern California?

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The rock found on a Northern California beach resembles concrete and may be man-made, potentially originating from early construction activities. If the included pebbles are rounded, it could be classified as pudding stone or conglomerate. If the pebbles vary in type, it may be identified as polymict conglomerate. Conversely, if the larger fragments are jagged, the rock could be categorized as breccia.
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I need help in figuring out what type of rock this is. I found it on a beach along the coast of Northern California.
 

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Honestly, looks like concrete (after some rounds of rolling around).
 
Welcome to PF.
Maybe man made concrete from early construction industry.
Pudding stone or conglomerate if the included pebbles are rounded.
Polymict conglomerate if the pebbles are different.
Breccia, if the larger fragments are jagged.
 
Thread 'The Secrets of Prof. Verschure's Rosetta Stones'

Thread 'The Secrets of Prof. Verschure's Rosetta Stones'

(Edit: since the thread title was changed, this first sentence is too cryptic: the original title referred to a Tool song....) Besides being a favorite song by a favorite band, the thread title is a straightforward play on words. This summer, as a present to myself for being promoted, I purchased a collection of thin sections that I believe comprise the research materials of Prof. Rob Verschure, who at the time was faculty in the Geological Institute in Amsterdam. What changed this...
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