Hackers' Pub

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earthling @appassionato@mastodon.social

1/19/2026, 8:30:58 AM

Public

Pictured is a 430 million-year-old Silurian Dalmanites caudatus from England. This 2.5-in- (6.4-cm-) long specimen was preserved in rock that, when carefully opened, revealed positive and negative splits! Notice that this trilobite is slightly disarticulated? A small brachiopod shell became wedged between the trilobite's head and body, causing them to separate.

via amnhnyc

#photography
#trilobites

Image Description
On the left is the positive split: A brown trilobite fossil is protruding from the surface of a beige stone. The trilobite has an oval-shaped body with a ribbed carapace; its head is smooth and rounded; its hind-end has a sharp point. On the right is the negative split. An indentation of the trilobite fossil can be seen in the stone; there's also a sea shell on the upper-half of the stone.

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