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Just dendrites of a weird sort?

Fossilizable

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Fossilizable Newbie

Fossilizable

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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! 

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Fossildude19 Regular Member

Fossildude19

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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.  :unsure:

 

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    Tim    -  VETERAN SHALE SPLITTER

   MOTM.png.61350469b02f439fd4d5d77c2c69da85.png      PaleoPartner.png.30c01982e09b0cc0b7d9d6a7a21f56c6.png.a600039856933851eeea617ca3f2d15f.png     Postmaster1.jpg.900efa599049929531fa81981f028e24.jpg    VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png  VFOTM  --- APRIL - 2015  

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Fossilizable Newbie

Fossilizable

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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.

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Mark Kmiecik Regular Member

Mark Kmiecik

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Possibly crab parts in cross-section?

 

 

Mark.

 

Fossil hunting is easy -- they don't run away when you shoot at them!

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