FossilsandScience Posted September 16, 2020 Share Posted September 16, 2020 Hey everyone! I was recently fossil hunting at Bolinas in California, which is known for its fossilized sand dollars. While hunting, I found this strange piece and I'm not sure if it's a fossil or not. It's from the Merced Formation, which is from the Late Pliocene to the Pleistocene in California. I have no clue what it is, but I am looking forward to hearing if anyone on the forum does. Thanks! Link to comment Share on other sites More sharing options...
Rockwood Posted September 16, 2020 Share Posted September 16, 2020 I think this looks like banded chert. An interesting rock, but not a fossil. 2 Link to comment Share on other sites More sharing options...
Steffen Langusch Posted September 16, 2020 Share Posted September 16, 2020 Ja, da stimme ich Rockwood zu. Ein gebändertes, wohl kieselsäurehaltiges Gestein, aber kein Fossil. Yes, I agree with Rockwood. A banded rock, probably containing silica, but not a fossil. Link to comment Share on other sites More sharing options...
Rockwood Posted September 16, 2020 Share Posted September 16, 2020 Easy for you to say. I think I get the point. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted December 27, 2020 Share Posted December 27, 2020 These are classic banded chert from the Miocene Monterey Formation. Behl, R.J., 2011, Chert spheroids of the Monterey Formation, California (USA): early diagenetic structures of bedded siliceous deposits, Sedimentology. published online: 28 Jun 2010; v. 58, p. 325–351. https://www.researchgate.net/profile/Richard_Behl/publication/229542577_Chert_spheroids_of_the_Monterey_Formation_California_USA_Early-diagenetic_structures_of_bedded_siliceous_deposits/links/59f72b3fa6fdcc075ec6325a/Chert-spheroids-of-the-Monterey-Formation-California-USA-Early-diagenetic-structures-of-bedded-siliceous-deposits.pdf?origin=publication_detail 3 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
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