Middle Ordovician 'marine dwarf world' found in Castle Bank, Wales NatureEcoEvo
such as digestive systems and even nerves are preserved, together with the limbs of tiny arthropods and delicate filter-feeding tentacles. Such exquisite detail is known from the best Cambrian faunas, but not previously from the Ordovician.represents a community of diverse marine organisms from the Middle Ordovician, and many of the shelly fossils were normal for these rocks.
The Cambrian witnessed the origin of the major animal groups. The Ordovician was a critical time in the history of life as well, with an extraordinary diversification of animals that produced hard skeletons and abundant fossils. In addition, more familiar ecosystems like today's coral reefs appeared by the end of the Ordovician. Until now, however, a big"gap" has existed between these two evolutionary events.
A few papers describing sponges and one on a primitive relative of modern arthropods called Mieridduryn have been published based on this fauna. Many more papers will follow and collections are ongoing. According to Dr. Muir,"Most fossil deposits of this importance are studied for many decades, and this is likely to be no different."
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