• Source: Malone Formation

The Malone Formation is a geologic formation in Texas. It preserves fossils dating back to the Jurassic period.




Description


One of the few geological formations in Texas dating to the Jurassic period, the Malone Formation unconformably overlies the Permian Briggs Formation, and laterally changes thickness dramatically from 45 meters on the east side to 325 meters in the northwest part of the Malone Mountains. It has been split into two subdivisions: a lower member containing Idoceras suggesting a Kimmeridgian age, and an upper member containing Kossmatia indicating a Tithonian age. Geochronological analysis of detrital zircon suggests an age of 151±2 Ma for the formation, supporting its dating to the late Jurassic.




= Depositional environment

=
The Malone Formation represents a fan-delta system in a shallow marine to marginal marine environment, deposited along the northern edge of the Chihuahua trough (a sedimentary basin mostly located in northeast Mexico). Many fossils found in the formation represent marine invertebrates.




Fossil content






= Vertebrates

=
Remains of vertebrates in this formation are rare and mostly poorly-preserved. Two cycloid fish scales, a pycnodont tooth and bone fragments of 'enaliosaurs' (a classification now obsolete) have been reported from the Malone Formation, but are not well-described.




= Invertebrates

=



Annelids




Bivalves




Bryozoans




Cephalopods




Corals




Echinoderms




Gastropods





= Plants

=
Fossil remains of plants, including driftwood, are abundant in the Malone Formation, but not well preserved.




See also



List of fossiliferous stratigraphic units in Texas
Paleontology in Texas




References



Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.

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