It's time for Trilobite Tuesday! Despite being covered in thick calcite carapaces, which often gave them the appearance of undersea battle tanks, trilobites were, in fact, rather delicately constructed creatures. Evidence of this apparent design “flaw” is pervasive throughout the fossil record, where disarticulated trilobite fragments, as seen in this Dalmaniites slab from Sweden, far outnumber the remains of complete specimens. In a number of fossiliferous biozones around the globe, including those in British Columbia, Morocco, and the Czech Republic, independent pygidia, cephala, and thoracic segments virtually litter the sedimentary strata…with often nary an articulated trilobite to be found.
There's a lake in NW Mississippi that's located on Devonian ground with rock that looks exactly like the above. I brought about 25 lbs. home to Arkansas and broke them up, didn't find a single whole Dalmaniites! I did find lots of cool stuff, though, including Crinoids with what appeared to be little nubbins all over them.
There are plenty of places where disarticulated shells accumulate due to waves and currents. You find places where there are lots of disarticulated clam shells but folk do not conclude clams are delicate - when they're alive.
I would assume that they shed their shells as they grew, like modern Arthropoda?
75 years ago today, Edward Lord Montagu arrived back in Beaulieu after being evacuated to Canada in the summer of 1940.
The sudden evacuation was 'heart-rending' for the 13 year old Edward but the tw..
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That’s not seaweed or kelp you’re seeing. It’s one of nature’s most spectacularly camouflaged animals: the leafy seadragon, Phycodurus eques. This fish lives in seagrass meadows and seaweed beds, and ..
Did you know you can upgrade your Beaulieu ticket to include our sister attraction Buckler's Hard?
Ask our visitor reception team for details during your next visit to Beaulieu and save up to 30%.