The Iower part of the Silurian Serrazin S/ates contain an exceptional accumulation of carbonaceous matter in the Serrazín Syncline (Segovia). Low grade Hercynian metamorphism had it transformed into graphite and/oP meta antracyte. Organic matter accumulated in anoxic seafloors during the Early Silurian marine transgression, probably due to upwel/ing and phitoplancton blooms
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