Detailed, 4.3" Jurassic Brittle Star (Palaeocoma) - Lyme Regis

 
This is a beautifully preserved fossil brittle star (Palaeocoma egertoni) from the Lyme Regis region on England. It is Lower Jurassic in age or approximately 190 million years old. It's been nicely prepared using air abrasives to expose the wonderful detail, and is nicely centered on a thick slab of sandstone. At about 4.3" wide and would be wider if the arms were outstretched and is good sized for the species. These brittle stars are extremely rare, particular examples as nice as this one.

The black "staining" on the rock near the center of the brittle star is pyrite. Often times these brittlestars have stable pyrite over the top of them, particularly on the central disk which spreads into the surrounding rock. This has to be ground away during preparation of the fossil. The grey spots on the rock near the central disk is remaining pyrite formations underneath the brittle star.
DETAILS
SPECIES
Palaeocoma egertoni
LOCATION
Lyme Regis, Dorset, England
FORMATION
Middle Lias, Margaritatus Zone
SIZE
4.3" wide, Rock 7.3x6.2"
ITEM
#121308
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