The Almejas Formation is a
geologic formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...
in Mexico. It preserves
fossils
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
dating back to the
Late Miocene
The Late Miocene (also known as Upper Miocene) is a sub-epoch of the Miocene epoch (geology), Epoch made up of two faunal stage, stages. The Tortonian and Messinian stages comprise the Late Miocene sub-epoch, which lasted from 11.63 Ma (million ye ...
to
Early Pliocene
Early may refer to:
Places in the United States
* Early, Iowa, a city
* Early, Texas, a city
* Early Branch, a stream in Missouri
* Early County, Georgia
* Fort Early, Georgia, an early 19th century fort
Music
* Early B, stage name of Jamaican d ...
of the
Neogene
The Neogene ( ,) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago ( Mya) to the beginning of the present Quaternary Period million years ago. It is the second period of th ...
period.
Fossil content
Various fossils have been found in the formation:
[Arroyo Delphin]
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
Mammals
* ''
Aivukus cedrosensis''
* ''
Albireo whistleri''
* ''
Balaenoptera sp.''
* ''
Denebola brachycephala''
* ''
Dusignathus santacruzensis''
* ''
Parapontoporia pacifica''
* ''
Piscolithax boreios''
* ''
Piscolithax tedfordi''
* ''
aff. Plesiocetus sp.''
* ''
Praekogia cedrosensis''
* ''
Thalassoleon mexicanus''
Birds
* ''
Cerorhinca minor''
* ''
Mancalla cedrosensis''
* ''
?Megapaloelodus opsigonus''
* ''
Morus sp.''
* ''
Puffinus tedfordi''
* ''
?Synthliboramphus sp.''
Fishes
* ''
Carcharodon cf. carcharias''
* ''
Carcharhinus sp.''
*
Megalodon
''Otodus megalodon'' ( ; meaning "big tooth"), Common name, commonly known as megalodon, is an extinction, extinct species of giant mackerel shark that lived approximately 23 to 3.6 million years ago (Mya), from the Early Miocene to the Earl ...
See also
*
List of fossiliferous stratigraphic units in Mexico
This is a list of stratigraphic units (groups, formations and members), containing fossils and pertaining to the North American country of Mexico.
List
See also
* Lists of fossiliferous stratigraphic units in North America
References
...
References
Geologic formations of Mexico
Neogene Mexico
Sandstone formations
Conglomerate formations of Mexico
Fossiliferous stratigraphic units of North America
Paleontology in Mexico
Baja California
{{Neogene-stub