A fossil Jewel Beetle from the Middle Miocene of the Satovcha Basin, Bulgaria.
[sciencythoughts.blogspot.com]
The Satovcha Basin, located in the southwestern Rhodope Mountains of Bulgaria, records a sequence of sedimentary and volcanic deposits laid down in a deep freshwater palaeolake that formed in an extensive graben (a structure formed when extensional activity draws rock structures apart, causing them to thin and sag, thereby creating a depression in the middle). The deep waters of the lake were eutrophic (lacking in oxygen), leading to excellent preservational conditions. The rocks of the basin are divided into two units, the Satovcha Formation, which comprises Oligocene volcanic and sedimentary deposits, and the Middle Miocene Sivik Formation, which overlies the Satovcha Formation unconformably includes a range of lake sediments, including a diatomite clay layer which has produced numerous Insect fossils, including a number of Dragonflies and March Flies which have previously been described.
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