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Dwrhyd Pit is exceptionally rich in fossils and gives a most valuable insight into the life which existed during Middle Cambrian times (515 million years ago).
The fossils were found in sediments of the middle Cambrian aged Exsulans limestone which outcrops on the island of Bornholm in the Baltic Sea.
Walcottidiscus (oldest undisputed edrioasteroid, from the Middle Cambrian Burgess Shale community)
Trilobite fossils are relatively common in the region west of Delta (part of the Wheeler Shale of Middle Cambrian age).
montis Matthew, 1889 is known from the Middle Cambrian of the Russian Federation (Kounamkites-zone, Daldyn river Basin, and Nekekit River; Ovatoryctocara-zone, Molodo River, Olenik Uplift, Yakutia; Shistocephalus antiquus-zone, Lena River), and Canada (Mount Stephen, British Columbia; Bathyuriscus-Elrathina-zone, Rocky Mountains).
deons Jell and Webbers, 1992 has been collected in the Middle Cambrian of Antarctica (Triplagnostus gibbus-zone, Edson Hills, Ellsworth Mountains, West Antarctica).
Pollingeria is a problematic genus the Middle Cambrian Burgess Shale.
The second species of Tuarangia to be described, Tuarangia gravgaerdensis, is from sediments of the middle Cambrian aged Ardrarum Limestone Formation which outcrops on the island of Bornholm in the Baltic Sea.