The Kirusillas Formation is a

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. ...

geologic formation of central Bolivia. The formation comprises

black shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g., kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especiall ...

s, overlies the Llallagua Formation and is overlain by the

Pampa The Pampas (; from Quechuan languages, Quechua 'plain'), also known as the Pampas Plain, are fertile South American low grasslands that cover more than and include the Argentina, Argentine Provinces of Argentina, provinces of Buenos Aires Pro ...

and Guayabillas Formations. The Kirusillas Formation is laterally equivalent to the

Lipeón Formation The Lipeón Formation is a Telychian to Pridoli geologic formation of southern Bolivia and northwestern Argentina. The formation comprises sandstones and siltstones. Plant fossils comprising rhyniophytes (specifically '' Aberlemnia'', '' Stegano ...

.Veizaga Saavedra et al., 2014, p.96Hacienda de Tapacari, 10 km from Huari, 120 km S of Oruro
at

Fossilworks Fossilworks was a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cr ...

.org The formation is a potential

source rock In petroleum geology, source rock is a sedimentary rock which has generated hydrocarbons or which has the potential to generate hydrocarbons. Source rocks are one of the necessary elements of a working petroleum system. They are organic-rich sedim ...

for

shale oil Shale oil is an unconventional oil produced from oil shale rock fragments by pyrolysis, hydrogenation, or thermal dissolution. These processes convert the organic matter within the rock (kerogen) into synthetic oil and gas. The resulting oil c ...

and

shale gas Shale gas is an unconventional natural gas that is found trapped within shale formations. Since the 1990s, a combination of horizontal drilling and hydraulic fracturing has made large volumes of shale gas more economical to produce, and ...

.Veizaga Saavedra et al., 2014, p.99

Fossil content

The formation has provided the following fossils: * '' Ornatosinuitina reyesi'' * '' Slimonia boliviana''Kjellesvig-Waering, 1973 * '' Styliolina sp.'' * Lingulata indet.

References

Bibliography

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Fossil content

See also

References

Bibliography

Further reading