Top Qs
Timeline
Chat
Perspective

Nemegt Formation

Geological formation in Mongolia From Wikipedia, the free encyclopedia

Nemegt Formationmap
Remove ads

The Nemegt Formation (also known as Nemegtskaya Svita) is a geological formation in the Gobi Desert of Mongolia, dating to the Late Cretaceous. The formation consists of river channel sediments and contains fossils of fish, turtles, crocodilians, and a diverse fauna of dinosaurs, including birds.

Quick Facts Type, Sub-units ...
Remove ads
Remove ads

Description

The Nemegt Formation is composed of mudstones and sandstones that were deposited by ancient lakes, streams, and flood plains. The Altan Uul locality was described by Michael Novacek as "a canyon carved out of a very rich series of sedimentary rocks" with "steep cliffs and narrow washes". The climate associated with it was wetter than when preceding formations were deposited; there seems to have existed at least some degree of forest cover. Fossilized trunks have been also found. These petrified wood, and the remains of Araucariaceae conifers indicate that the forests of the Nemegt were thickly wooded, with a high canopy formed by tall conifer trees. When examined, the rock facies of this formation suggest the presence of stream and river channels, mudflats, and shallow lakes. Sediments also indicate that there existed a rich habitat, offering diverse food in abundant amounts that could sustain massive Cretaceous dinosaurs.[1][2]

Remove ads

Stratigraphy

Thumb
Nemegt and Barun Goyot formations intersection

The most recent stratigraphy divides the Nemegt Formation into three informal members. The lower member is dominated by fluvial deposits, while middle and upper members consist of alluvial plain, paludal, lacustrine, and fluvial deposits. The colour of the sediments is usually light grey to tan in colour in comparison to the typically red colour of the underlying Barun Goyot Formation.[3] It overlies and sometimes interfingers with the Barun Goyot Formation. Interfingering has been noted at the stratotype (Red Walls) and Hermiin Tsav.[3] There has been no absolute dating of the Nemegt Formation. Historically the Nemegt has been considered late Campanian to Maastrichtian, based on comparisons of fossils present, but no exact dating has been performed. The age for the underlying Baruungoyot Formation (= Svita) has been suggested as Santonian to Campanian, and Shuvalov (2000) found K-Ar dating of basalts that they referred to the mid and upper Baruungoyot to be 75 to 80 million years old.[4]

Remove ads

Paleobiota of the Nemegt Formation

Summarize
Perspective

Stratigraphic positions are based on Eberth (2018) who correlated localities to their approximate position within the formation.[3]

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Amphibians

More information Genus, Species ...

Crocodylomorphs

More information Genus, Species ...

Fish

More information Genus, Species ...

Flora

More information Genus, Species ...

Invertebrates

More information Genus, Species ...

Mammals

More information Genus, Species ...

Pterosaurs

More information Genus, Species ...

Turtles

More information Genus, Species ...

Dinosaurs

Ornithischians

Ankylosaurs
More information Genus, Species ...
Hadrosaurs
More information Genus, Species ...
Pachycephalosaurs
More information Genus, Species ...

Sauropods

More information Genus, Species ...

Theropods

Alvarezsaurs
More information Genus, Species ...
Birds
More information Genus, Species ...
Dromaeosaurs
More information Genus, Species ...
Ornithomimosaurs
More information Genus, Species ...
Oviraptorosaurs
More information Genus, Species ...


Therizinosaurs
More information Genus, Species ...
Troodontids
More information Genus, Species ...
Tyrannosaurs
More information Genus, Species ...
Remove ads

See also

References

Loading content...
Loading related searches...

Wikiwand - on

Seamless Wikipedia browsing. On steroids.

Remove ads