Gerard Troost (1776-1850) was a Dutch paleontologist and geologist who came to America in 1810. In 1831 he became State Geologist of Tennessee. His special interest was the crinoid class of the ...
The Crinoidea, a class of marine echinoderms, have long captivated palaeontologists as one of the most enduring and diverse components of the marine fossil record. Their evolutionary history spans ...
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