Jdeutsch Posted November 19, 2015 Share Posted November 19, 2015 I have what I think is a fragment from a Cretaceous Texas cephalopod-ammonite. The diameter of the fragment is about a centimeter, but it doesn't have much of an arc. I am trying to imagine what the full specimen would have looked like. Is this fragment from a straight cephalopod or is it from a very large spiral? Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 19, 2015 Share Posted November 19, 2015 Maybe a Heteromorph ammonite? Regards, Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 IPFOTM -- MAY - 2024 _________________________________________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
jpc Posted November 19, 2015 Share Posted November 19, 2015 idiohamites? But I will allow team TX to chime in... Link to comment Share on other sites More sharing options...
BobWill Posted November 19, 2015 Share Posted November 19, 2015 (edited) Who needs TX when WY is on the case? jpc is right. The most common species here is Idiohamites fremonti. If it's not too worn look for a row of tubercles at the ventrolateral margins. The full ammonite looks like a double-ended candy cane with an open whorl at the umbilical end and a straight shaft ending in a hook followed by another, parallel shaft leading to the aperture. Edited November 19, 2015 by BobWill 2 Link to comment Share on other sites More sharing options...
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