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Antlers Formation

{{Infobox Rockunit

| name = Antlers Formation

| image =

| caption =

| type = Geological formation

| period = Aptian

| age = Aptian
~{{fossil range|120|112}}

| prilithology = Mudstone

| otherlithology = Sandstone

| namedfor =

| namedby = Robert Thomas Hill{{cite journal|last1=Hill|first1=R.T.|title=Geology of parts of Texas, Indian Territory and Arkansas adjacent to Red River|journal=Bulletin of the Geological Society of America|date=1894|volume=5|page=303}}

| region = Oklahoma, Texas

| country = United States

| coordinates =

| unitof =

| subunits =

| underlies =

| overlies =

| thickness =

| extent =

| area =

| map =

| map_caption =

}}

The Antlers Formation is a stratum which ranges from Arkansas through southern Oklahoma into northeastern Texas. The stratum is {{convert|150|m|abbr=on}} thick consisting of silty to sandy mudstone and fine to coarse grained sandstone that is poorly to moderately sorted. The stratum is cemented with clay and calcium carbonate. In places the sandstone may be conglomeratic or ferruginous (rich in iron oxides).

Based on correlation with the Trinity Group of Texas, the Antlers Formation is estimated to be late Aptian-early Albian. This age range is supported by the presence of two dinosaurs that are also known from the Cloverly Formation, Deinonychus and Tenontosaurus.

Amphibians

Indeterminate frog remains. Possible indeterminate salamander remains.

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Amphibians of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Abundance

! Notes

! Images

Albanerpeton

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Albanerpeton arthridion

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| rowspan="99" |

File:Albanerpeton BW.jpg]]

Fish

References: Cifelli et al. 1999; Wedel et al. 2000, Kielan-Jarorowska and Cifelli 2001; Nydam and Cifelli 2002.

=Cartilaginous fish=

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Chondrichthyans of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Abundance

! Notes

! Images

rowspan="2" |

Hybodus

|

Hybodus butleri

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Hybodontidae

| rowspan="99" |

File:Hybodus fraasi (fossil).jpg]]

?Hybodus sp.

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Lissodus

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Lissodus anitae

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Polyacrodontidae

=Ray-finned fish=

Possible indeterminate amid remains. Possible indeterminate lepisosteid remains. Possible indeterminate semionotidae remains.

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Actinopterygians of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Abundance

! Notes

Gyronchus

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Gyronchus dumblei

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|

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?Palaeobalistum

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?Palaeobalistum sp.

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|

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Mammals

Possible indeterminate deltatheroidan material. Indeterminate multituberculate remains. Indeterminate tribosphenidan remains.

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Mammals of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Abundance

! Notes

Astroconodon

|

Astroconodon sp.

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|

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Atokatheridium

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Atokatheridium boreni

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?Paracimexomys

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Paracimexomys crossi

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Reptiles

=Crurotarsans=

Possible indeterminate atoposaurid remains. Possible indeterminate goniopholidid remains. Possible indeterminate pholidosaurid remains.

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Crurotarsans of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Abundance

! Notes

! Images

Bernissartia

|

Bemissartia sp.

|

|

|

|

| rowspan="99" |

File:Bernissartia BW.jpg]]

=Lepidosaurs=

Possible indeterminate scincid remains.

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Lepidosaurs of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Abundance

! Notes

Atokasaurus

|

Atokasaurus metarsiodon

|

|

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Ptilotodon

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Ptilotodon wilsoni

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|

|

|

=Ornithischians=

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Ornithischians of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Abundance

! Notes

! Images

Tenontosaurus

|

Tenontosaurus sp.

|

|

|

|

| rowspan="99" |

File:Tenontosaurus BW.jpg]]

=Saurischians=

Possible indeterminate bird remains are known from the formation.

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Saurischians of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Material

! Notes

! Images

Acrocanthosaurus

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Acrocanthosaurus atokensis

|

|

|

|

| rowspan="99" |

File:Acrocanthosaurus restoration.jpg]]

File:Astrodon johnstoni.jpg]]

File:Deinonychus ewilloughby.png]]

File:Sauroposeidon proteles (flipped).jpg]]

Astrodon

|

Astrodon sp.

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Deinonychus

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Deinonychus antirrhopus

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Sauroposeidon

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Sauroposeidon proteles

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"[Four] cervical vertebrae.""Table 13.1," in Weishampel, et al. (2004). Page 267.

|

=Turtles=

class="wikitable" align="center" width="100%"
colspan="7" align="center" |Turtles of the Antlers Formation
Genus

! Species

! Location

! Stratigraphic position

! Abundance

! Notes

?Glyptops

|

Glyptops sp.

|

|

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Naomichelys

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Naomichelys sp.

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See also

References

Further reading

  • Cifelli, R. Gardner, J.D., Nydam, R.L., and Brinkman, D.L. 1999. Additions to the vertebrate fauna of the Antlers Formation (Lower Cretaceous), southeastern Oklahoma. Oklahoma Geology Notes 57:124-131.
  • Nydam, R.L. and R. L. Cifelli. 2002a. Lizards from the Lower Cretaceous (Aptian-Albian) Antlers and Cloverly formations. Journal of Vertebrate Paleontology. 22:286–298.
  • Kielan-Jarorowska, Z., and Cifelli, R.L. 2001. Primitive boreosphenidan mammal (?Deltatheroida) from the Early Cretaceous of Oklahoma. Acta Palaeontologica Polonica 46: 377-391.
  • Wedel, M.J., Cifelli, R.L., and Sanders, R. K. 2000. Sauroposeidon Proteles, A new sauropod from the Early Cretaceous of Oklahoma. Journal of Vertebrate Paleontology 20:109-114.

Category:Lower Cretaceous Series of North America

Category:Cretaceous geology of Oklahoma

Category:Cretaceous Arkansas

Category:Cretaceous geology of Texas

Category:Aptian Stage

Category:Natural history of Oklahoma

Category:Natural history of Arkansas

Category:Natural history of Texas

Category:Paleontology in Texas

Category:Paleontology in Arkansas

Category:Paleontology in Oklahoma

Category:Mudstone formations of the United States

Category:Sandstone formations of the United States