Ravendi Posted February 6, 2017 Share Posted February 6, 2017 Hello! I am not really a fossil collector- or any kind of expert- but I do like to collect natural things I find in various places, and have held on to these for a few years without having an idea if they're really anything at all. I found this forum and would absolutely love some help! Even if there is no identification to be had, it would be great to know if it's still worth holding onto- or... just a rock. The first is a white hard substance with some interesting spiral patterns in it. As you can see in the first photo, the inside chamber of the main form is hollow. I found it on a California beach, probably Pismo? Link to comment Share on other sites More sharing options...
Ravendi Posted February 6, 2017 Author Share Posted February 6, 2017 The second is the one I’m more intrigued about. There are what looks to be some small, possibly chambered spiral shapes in here (see arrow in first picture)- similar to an ammonite perhaps? Or it could just be the way the rock is patterned. This was also found in California, I believe in Cambria, on Moonstone beach. Any help would be much appreciated! Thanks so much you guys! Link to comment Share on other sites More sharing options...
Ravendi Posted February 6, 2017 Author Share Posted February 6, 2017 Also, one last thing- fossilized tube worm? Or something like it? Plus bonus fossilized sand dollar- one of my favorite finds! Link to comment Share on other sites More sharing options...
Darktooth Posted February 6, 2017 Share Posted February 6, 2017 Welcome to the forum from New York! You have some interesting finds but sorry I can't help with id. I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
Boesse Posted February 6, 2017 Share Posted February 6, 2017 The rock from Cambria is probably metamorphic or igneous, as there's almost nothing in the way of fossils or sedimentary rocks in that region. The very last specimen is a sand dollar, possibly Astrodapsis - a common late Miocene sand dollar. 4 Link to comment Share on other sites More sharing options...
Vieira Posted February 6, 2017 Share Posted February 6, 2017 In first Picture I'am only seeing some tube worms. The third one it is tube worms too. The last one it's a echinoid, a sand dollar. Link to comment Share on other sites More sharing options...
Ravendi Posted February 6, 2017 Author Share Posted February 6, 2017 Thanks for the input guys, I appreciate the feedback! Link to comment Share on other sites More sharing options...
abyssunder Posted February 6, 2017 Share Posted February 6, 2017 The second one looks like Agate . " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
AncientEarth Posted May 30, 2018 Share Posted May 30, 2018 First specimen, looks like agate shells out of the vaqueros that are extremely watern worn. Second specimen is a chunk of Rhyolite and perlite, the exterior of a geode known as a thunderegg that we find locally. Some would call what you found "mushroom rhyolite" Worm tube and astrodapsis are correct for the others. Link to comment Share on other sites More sharing options...
siteseer Posted May 30, 2018 Share Posted May 30, 2018 On February 5, 2017 at 10:17 PM, Boesse said: The rock from Cambria is probably metamorphic or igneous, as there's almost nothing in the way of fossils or sedimentary rocks in that region. The very last specimen is a sand dollar, possibly Astrodapsis - a common late Miocene sand dollar. Hi Bobby, That sand dollar matrix looks similar to what used to be called the "Neroly" Formation, part of the San Pablo Group. It think it has a different name now. There's a site in Rodeo (Contra Costa County) you might have checked in the past. It's on a residential street. The most common fossil there is a dime-quarter size Astrodapsis and some smaller mollusks plus bits of larger ones, as I recall. I never saw a vertebrate bit of any kind. Jess 1 Link to comment Share on other sites More sharing options...
Nate35 Posted April 25, 2019 Share Posted April 25, 2019 I agree the second photo looks like mushroom rhyolite. Link to comment Share on other sites More sharing options...
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