HeatherT Posted October 10, 2017 Share Posted October 10, 2017 I love this piece. Every time I look at it i see something new. Although, I have no idea what I'm looking at. This was left behind by previous tenants so its exact location is a mystery. I live in Arizona and have found many shells just not like these. I'm excited to learn more about my fossils. Link to comment Share on other sites More sharing options...
doushantuo Posted October 10, 2017 Share Posted October 10, 2017 Nice piece. Bits of bivalve/pelecypod/lamellibranch("clams",so: Mollusca) and serpulids("worm tubes") This not a coquina(see below,Ynot's remark) Link to comment Share on other sites More sharing options...
ynot Posted October 10, 2017 Share Posted October 10, 2017 Welcome to TFF! Your rock is a piece of cocquina. It is a sandstone made up with a bunch of shell pieces. Looks like it also has some tube worm shells on it (3rd picture). These are most likely recant and indicate the piece was found at the ocean. 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Rockwood Posted October 10, 2017 Share Posted October 10, 2017 5 hours ago, doushantuo said: This not a coquina(see below) ? Link to comment Share on other sites More sharing options...
ynot Posted October 10, 2017 Share Posted October 10, 2017 10 hours ago, doushantuo said: This not a coquina( How is this not a coquina? Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Al Dente Posted October 10, 2017 Share Posted October 10, 2017 A true coquina is composed of abraded shell pieces that are cemented together with little to no matrix. It is almost pure shell. 1 Link to comment Share on other sites More sharing options...
ynot Posted October 10, 2017 Share Posted October 10, 2017 2 minutes ago, Al Dente said: A true coquina is composed of abraded shell pieces that are cemented together with little to no matrix. It is almost pure shell. Oh, that makes sense. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
FossilDAWG Posted October 10, 2017 Share Posted October 10, 2017 The last photo shows a cross section of a chunk of a sand dollar type echinoid, with the edge of an upside-down bivalve surrounding it (the beak area with the hinge is at the bottom of the photo). The tube worms and bryozoans in the third photo are certainly recent, they grew there as the rock was submerged in fully marine conditions, as these organisms don't become so densely populated in brackish water (and they are absent in fresh water). So, we have a rock with several worn but almost whole bivalves, and a large piece of a sand dollar, encased in a matrix that looks like a porous sandy carbonate mostly made up of small rounded fragments of shell, and this rock spent a significant amount of time submerged in the ocean. Presumably it was eventually cast up on the shore where it was picked up and brought home by some previous tenant. Such specimens are common in many areas of the eastern Florida coast, and I have seen similar (but not identical) rock textures on South Carolina beaches, and those would be my guess as to its possible origin. However, I imagine there could be areas on the West coast that could also yield such a specimen, though I don't know of any personally. Don 1 Link to comment Share on other sites More sharing options...
Arizona Chris Posted October 10, 2017 Share Posted October 10, 2017 That is an awesome rock! Those worm tubes are amazing, such a concentration of them.. I believe they are microconchids but this would assume this piece is Paleozoic. Somehow, it looks more recent than this. Man, Id love to know where THAT one came from! :0 ---------------------------------------------------------------------------------------------------------------------------- Arizona Chris Paleo Web Site: http://schursastrophotography.com/fossiladventures.html Link to comment Share on other sites More sharing options...
Miocene_Mason Posted October 10, 2017 Share Posted October 10, 2017 Reminds me of Venus clams you get over here in the Choptank (not saying it's from this, matrix looks different and I haven't found any serpulids there)l the matrix reminds me of the Cenozoic stuff. Here's the closest Venus clam I have at hand “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
Rockwood Posted October 10, 2017 Share Posted October 10, 2017 8 hours ago, Al Dente said: A true coquina is composed of abraded shell pieces that are cemented together with little to no matrix. It is almost pure shell. Request a recount. Looks like if it were sectioned include worn away and covered up shells, made less visible so, we might make it to almost. Link to comment Share on other sites More sharing options...
westcoast Posted October 11, 2017 Share Posted October 11, 2017 We need a ruling from the Coquina Adjudicator please Link to comment Share on other sites More sharing options...
fifbrindacier Posted October 11, 2017 Share Posted October 11, 2017 15 hours ago, WhodamanHD said: Reminds me of Venus clams you get over here in the Choptank (not saying it's from this, matrix looks different and I haven't found any serpulids there)l the matrix reminds me of the Cenozoic stuff. Here's the closest Venus clam I have at hand Or an inocerame ? To verify this it would be useful to put off a little of the matrix near the hinge, but precautiously because i see a failure on that shell, so, if the matrix is hard it would surely break. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Miocene_Mason Posted October 11, 2017 Share Posted October 11, 2017 9 hours ago, fifbrindacier said: Or an inocerame ? To verify this it would be useful to put off a little of the matrix near the hinge, but precautiously because i see a failure on that shell, so, if the matrix is hard it would surely break. Inoceramus went extinct at the end of the Cretaceous, which does sometimes have unconsolidated material. @HeatherTs doest look like one as is, but prepping could prove me wrong. “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
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