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The most common brachiopod in the Ordovician of Britain are Natica and Bairdiella, and the most abundant brachiopod in the Ordovician of the North Sea is Natica. These brachiopods were relatively abundant in the Ordovician of the British Isles, forming dense siltstone beds and thick laminations, often with a Spirifer mudstone layer as a local maximum. In the Ordovician rocks of the British Isles, Natica is the most common brachiopod, Bairdiella is the second most common, and Platyhyalina is the least common. Lingula is rare in the Ordovician of the British Isles.
Like many other brachiopods, Dryoconcho, are the result of recent evolutionary radiations and are now abundant in shallow coastal waters of the Northern Hemisphere, but the fossil record of the group is very scarce. This species has been described from a single find in the United Kingdom consisting of only a few individuals that were preserved in fossil wood. The specimens from coastal deposits in France and the United Kingdom are from rocks of similar age with similar facies and are remarkably similar to the one described from the UK. So the variety of shells and the fossil type of the UK specimen are highly unusual in the fossil record of the group.
Fossil brachiopods are very important in understanding past environments and in interpreting the distribution patterns of brachiopods in rocks. The size and abundance of brachiopod fossils is often used to estimate the depth at which they lived, and hence the temperature and salinity of the environment. The diameter of the shells of brachiopods is an important indicator of the environmental conditions in which they lived.
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