2-587: The Kirusillas Formation is a Homerian geologic formation of central Bolivia. The formation comprises black shales , overlies the Llallagua Formation and is overlain by the Pampa and Guayabillas Formations . The Kirusillas Formation is laterally equivalent to the Lipeón Formation . The formation is a potential source rock for shale oil and shale gas . The formation has provided
4-839: The following fossils: Homerian In the geologic timescale , the Homerian is an age of the Wenlock Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon that is comprehended between 430.5 ± 0.7 Ma and 427.4 ± 0.5 Ma (million years ago), approximately. The Homerian Age succeeds the Sheinwoodian Age and precedes the Gorstian Age. The name comes from
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