Sabinal Formation

The Sabinal Formation is a Late Jurassic and Early Cretaceous-aged geological formation in Oaxaca, Mexico. It preserves a highly diverse marine fauna.^[1][2]

Typesedimentary

Unit ofTlaxiaco Basin

UnderliesTlaxiaco Formation

OverliesConsuelo Group, Tecocoyuncan Group

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Sabinal Formation
Stratigraphic range: Kimmeridgian to Valanginian PreꞒ Ꞓ O S D C P T J K Pg N
Type	sedimentary
Unit of	Tlaxiaco Basin
Underlies	Tlaxiaco Formation
Overlies	Consuelo Group, Tecocoyuncan Group
Lithology
Primary	Shale
Other	Mudstone, wackestone, marl
Location
Coordinates	17.3°N 97.7°W / 17.3; -97.7
Approximate paleocoordinates	11.6°N 49.7°W / 11.6; -49.7
Region	Oaxaca
Country	Mexico
Sabinal Formation (Mexico)

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It was initially thought to only encompass the Late Jurassic (Kimmeridgian & Tithonian), but more recent studies have redefined it to cover the earliest Cretaceous (Berriasian & Valanginian) as well. It is part of the Tlaxiaco Basin, a prominent structural basin in southern Mexico that accumulated both continental and marine sediments between the Early Jurassic and the Paleogene.^[2] The most prolific site of the formation is the Kimmeridgian-aged Llano Yosobe site near Tlaxiaco.^[1]