The Mulde formation is a sequence of Silurian bluish-gray marlstone and agrillceous limestones found on the southwestern part of the island of Gotland. It generally becomes harder and less marly in the upper parts of the formation.Sunstones and catskulls. Guide to the Fossils and geology of Gotland. Sara Elison. s.64. 2000
Fossil content The formation holds some of the best fossils on Gotland, being the best place to find well preserved trilobites. Some examples are Calymene, Dalmanites, Encrinurus and Proteus.Studies on Silurian Trilobites form Gotland, Sweden. Lars Ramsköld. s13-15. 1985 Ostracods (beyrichids etc.), brachiopods (Atrypa reticularis, Leptaena, Eospirifer etc.), bryozoans and tentaculitids are also relatively common while corals, grapolites, annelids and cephalopods are more rare.Beskrivning till kartbladet Klintehamn. Henr. Munthe, J. Ernhold Hede, G. Lundqvist. s36-38. 1927
See also Geology of Gotland
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