Reeve's Bonebed: Difference between revisions
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''[[Merycoidodon]]'' |
''[[Merycoidodon]]'' |
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91: midly common |
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91 |
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''[[Bathygenys]]'' |
''[[Bathygenys]]'' |
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709: extremly common |
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709 |
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hundreds of endocasts (see below) |
hundreds of endocasts (see below) |
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''[[Hendryomeryx]] defordi'' |
''[[Hendryomeryx]] defordi'' |
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2: exteremly rare |
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2 |
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''[[Leptomeryx]]'' |
''[[Leptomeryx]]'' |
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10 |
10: rare |
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''[[Eotylopus]] reedi'' |
''[[Eotylopus]] reedi'' |
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1: extremly rare |
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1 |
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''[[Agriochoerus]]'' |
''[[Agriochoerus]]'' |
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15: average abundance |
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15 |
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''[[Leptotragulus]]'' |
''[[Leptotragulus]]'' |
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1: exteremly rare |
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1 |
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''[[Heteromeryx]] defordi'' |
''[[Heteromeryx]] defordi'' |
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2: exteremly rare |
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2 |
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''[[Eutypomys]] inexpectatus'' |
''[[Eutypomys]] inexpectatus'' |
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13: average abundance |
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13 |
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''[[Pseudotomus]] johanniculi'' |
''[[Pseudotomus]] johanniculi'' |
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1: exteremly rare |
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1 |
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holotype |
holotype |
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''[[Leptotomus]]'' |
''[[Leptotomus]]'' |
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1: exteremly rare |
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1 |
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''[[Ardynomys]]'' |
''[[Ardynomys]]'' |
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1: exteremly rare |
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1 |
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''[[Cylindrodon]] fontis'' |
''[[Cylindrodon]] fontis'' |
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3: exteremly rare |
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3 |
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''[[Colodon]]'' |
''[[Colodon]]'' |
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4: rare |
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4 |
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''[[Mesohippus]]'' |
''[[Mesohippus]]'' |
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11: average abundance |
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11 |
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''[[Hyracodon]] primus'' |
''[[Hyracodon]] primus'' |
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1: exteremly rare |
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1 |
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''[[Menodus]] bakeri'' |
''[[Menodus]] bakeri'' |
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1: exteremly rare |
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1 |
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''[[Miacis cognitus]]'' |
''[[Miacis cognitus]]'' |
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1: exteremly rare |
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1 |
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[[holotype]] |
[[holotype]] |
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''[[Hyaenodon]]'' |
''[[Hyaenodon]]'' |
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2: exteremly rare |
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2 |
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Revision as of 15:21, 6 July 2011
A geological formation in Presidio county, Texas, with the coordinates of 29.9° N, 104.2° W. It is placed in the late Eocene and early Oligocene.
Geology
Reeves bonebed lies in the Vieja Formation
Ecology
The University of Texas holds a large collection of fossils from Reeves bonebed. The number of specimens held in their collection from the Reeve's Bonebed are displayed in the abundance column[1]:
Mammals
| Order | Family | Genus | Abundance (?/870) | Notes |
|---|---|---|---|---|
|
91: midly common |
||||
|
709: extremly common |
hundreds of endocasts (see below) | |||
|
Hendryomeryx defordi |
2: exteremly rare |
|||
|
10: rare |
||||
|
Eotylopus reedi |
1: extremly rare |
|||
|
15: average abundance |
||||
|
1: exteremly rare |
||||
|
Heteromeryx defordi |
2: exteremly rare |
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|
Eutypomys inexpectatus |
13: average abundance |
|||
|
Pseudotomus johanniculi |
1: exteremly rare |
holotype | ||
|
1: exteremly rare |
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1: exteremly rare |
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|
Cylindrodon fontis |
3: exteremly rare |
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4: rare |
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11: average abundance |
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Hyracodon primus |
1: exteremly rare |
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Menodus bakeri |
1: exteremly rare |
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1: exteremly rare |
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2: exteremly rare |
For fossils of which an exact genus cannot be assigned, there have been discovered...
Oreodont Braincasts
Reeves bonebed is known for the recovery of casts of the brain cavity of oreodonts called endocasts.[2] When and animal dies and the soft tissues decay, sediments fill the orifices left, including the brain case. If the bone falls apart, the fossil that used to be housed on the inside of the skull can remain. Hundreds of brain casts, mainly from Bathygenys, were recovered from Reeves bonebed and have been used to gauge the size of the brain as well as the size of the lobes. Physical arrangement of the brain can lead to clues about the life of the living animal, such as how important smell was to it, as used in CT scans of Tyrannosaurus. Studies involving more than 150 of these endocasts have been performed from the Reeves bonebed samples.[3]
References
- ^ University of Texas, Austin. Bonebed&county=&state=&specid=&geol_form=&epoch=&site_no=&showimage=&geog=&country=&others=&geol=&epoch=&period=&age=&era=&strat=&formation=&group=&horizon=&member=&sorted_by= "Reeves bonebed".
{{cite web}}: Check|url=value (help) - ^ "Oreodont braincasts".
- ^ Macrini, Thomas E. "Description of a Digital Cranial Endocast of Bathygenys reevesi (Merycoidodontidae; Oreodontoidea) and Implications for Apomorphy-Based Diagnosis of Isolated, Natural Endocasts".