Fossilizable Posted August 28 Share Posted August 28 These discolorations, perfectly flush with the rock surface, are in sandstone from the Matilija or Coldstone formation, I think. Some of the pattern suggests dendrites maybe, but perhaps it's organic in origin? About 8 cm long, 3 wide. Ventura County, CA. Thanks! 2 Link to post Share on other sites
Fossildude19 Posted August 28 Share Posted August 28 These look like cross sections of pectinid bivvaes to me. What is the size of these markings? EDIT: I missed the size listed in the post. 8 cm. Is rather large for graptolites. 3 Link to post Share on other sites
minnbuckeye Posted August 28 Share Posted August 28 Graptolites? Again, size is important. 2 Link to post Share on other sites
Ludwigia Posted August 28 Share Posted August 28 I agree with Tim. I don't think that they're graptolites. Link to post Share on other sites
Fossilizable Posted August 28 Author Share Posted August 28 Thanks for the responses! I'll get back up there with a ruler, but just to clarify I meant to say each of the two imprints of a sheath (or whatever) is about 8 cm long. For what it's worth. Link to post Share on other sites
Mark Kmiecik Posted August 28 Share Posted August 28 Possibly crab parts in cross-section? Link to post Share on other sites
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