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Some studies that dealt mostly with Upper Cambrian and Lower Ordovician trilobites included descriptions of brachiopods.
Clearly visible within the imprint were the remains of trilobites , extinct marine arthropods.
These fossils include graptolites, trilobites , and various types of microfossils visible only under the microscope.
In recent years Cambrian trilobites and brachiopods have been discovered in Bhutan, close to the eastern syntaxis of the Himalaya.
But in fact, there are very distinct patterns found in the fossil record of trilobites .
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