Swisshelm Mts. amphibian site: Westphalian A - Westphalian B, Arizona
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Agnatha
- Conodontophorida
|
||||||||||
|
Adetognathus lautus
|
conodont |
|||||||||
|
Adetognathus gigantus
|
conodont |
|||||||||
|
Idiognathodus humerus
|
conodont |
|||||||||
|
Idiognathodus delicatus
|
conodont |
|||||||||
|
Agnatha
- Conodonta
|
||||||||||
|
Spathognathodus coloradoensis
|
conodont |
|||||||||
|
Chondrichthyes
- Xenacanthiformes
- Xenacanthidae
|
||||||||||
|
Xenacanthidae indet.
Fritsch 1889
|
elasmobranch |
|||||||||
|
Chondrichthyes
- Petalodontiformes
- Petalodontidae
|
||||||||||
|
Petalodontidae indet.
Newberry and Worthen 1866
|
chimaera |
|||||||||
|
Gnathostomata
- Dipnoi
- Lepidosirenidae
|
||||||||||
|
cf. Gnathorhiza serrata
Cope 1883
|
lungfish |
|||||||||
| genus name spelled "Gnathoriza" in the reference | ||||||||||
|
unclassified
|
||||||||||
|
? Helodontidae indet.
|
||||||||||
|
Tetrapoda
|
||||||||||
|
Tetrapoda indet.
Goodrich 1930
|
||||||||||
| UALP 4956 (single limb fragment), 5267 ("collection of large tetrapod bone fragments") | ||||||||||
|
Amphibia
- Lepospondyli
|
||||||||||
|
? Lepospondyli indet.
(von Zittel 1887)
|
23 elements | tetrapod |
||||||||
| UALP 5186 (two fragmentary ulnae), 5187 (? pectoral girdle element), 5189 (? fibula), 5199 (single atlas), 5200 (fragment of left femur), 5232 (pterygoid), 5242 (a jaw reminiscent of Hylerpeton longidentatum), 5251, 5252 (both are incomplete tibiae), 5253 to 5255 (all are probably fibulae), 6023 (two ribs), 6226 (crushed left humerus), 6228 (rib), 6230 (several radii), 6231 (scapula with associated clavicle or cleithrum), 6235 (pterygoid); list comprises only the more complete specimens | ||||||||||
|
Amphibia
- Microsauria
- Gymnarthridae
|
||||||||||
|
Elfridia bulbidens n. gen., n. sp.
Thayer 1985
|
21 elements | tetrapod |
||||||||
| UALP 4960, 4961, 4969, 4970 (type), 5171, 5172, 5176, 5226, 5230, 5231, 5865 to 5868, 6037, 6038, 6225, 6232 to 6234, 6238 (all are single bones or bone fragments) | ||||||||||
|
Amphibia
- Aistopoda
- Ophiderpetontidae
|
||||||||||
|
Ophiderpeton swisshelmense n. sp.
Thayer 1985
|
15 elements | tetrapod |
||||||||
| UALP 4958, 4963, 5149, 5164, 5167 (type), 5168, 5175, 5202, 5208, 5692, 5864, 6036, 6057, 6058, 6222 (all are single vertebrae) | ||||||||||
|
Amphibia
- Aistopoda
|
||||||||||
|
Phlegethontia phanerhapha n. sp.
Thayer 1985
|
2 specimens | tetrapod |
||||||||
| nomen dubium belonging to Phlegethontiidae | ||||||||||
| UALP 5154 (type), 6035 | ||||||||||
|
Stegocephali
- Nectridea
- Urocordylidae
|
||||||||||
|
? Ptyonius olisthmonaias n. sp.
Thayer 1985
|
14 elements | tetrapod |
||||||||
| UALP 5161, 5162, 5170, 5207, 5211, 5212, 5264 (type), 5694, 5857 to 5860, 6212, 6223 (all are single bones) | ||||||||||
|
Stegocephali
- Nectridea
|
||||||||||
|
Arizonerpeton wellsi n. gen., n. sp.
Thayer 1985
|
24 elements | tetrapod |
||||||||
| UALP 4947 (type), 4948 to 4950, 4957, 5147, 5148, 5151, 5152, 5156 to 5158, 5163, 5165, 5181, 5203, 5266, 5691, 5693, 5701, 5861 to 5863, 6211 (all are single vertebrae) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Arizona | County: | Cochise |
| Coordinates: | 31.7° North, 109.6° West (view map) | ||||
| Paleocoordinates: | 3.8° South, 44.2° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Altitude: | 1585 meters | ||||
| Geographic resolution: | small collection |
Time
| Period: | Carboniferous |
| 10 m.y. bin: | Carboniferous 4 |
| Key time interval: | Westphalian A - Westphalian B |
| Age range of interval: | 318.1 - 311.3 m.y. ago |
Stratigraphy
| Formation: | Black Prince Limestone | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "The amphibian bed [is] located one meter below the top of the Black Prince [Limestone] [...] The Swisshelm Mountain amphibian bed is dated near the Morrowan-Derryan(= Atokan) boundary, equivalent to the boundary of Westphalian A and B of Europe" (Thayer, 1985). | |||||
Lithology and environment
| Primary lithology: | intraclastic,shelly/skeletal,gray,yellow silty "limestone" |
| Includes fossils? | Y |
| Lithology description: "light yellow-gray, silty intrabiomicrudit" | |
| Environment: | shallow subtidal indet. |
| Geology comments: "The interpretation best fitting the evidence is a partially protected estuarine environment (for the algal oncolites and marine fauna), close to the outlet of a sluggish coastal river (for transporting the terrestrial and freshwater faunal elements)." (Thayer, 1985). | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,microfossils |
| Preservation of anatomical detail: | variable |
| Articulated whole bodies: | none |
| Temporal resolution: | time-averaged |
| Spatial resolution: | allochthonous |
| Taphonomy comments: Some bones show traces of wear through transport, others are completely unworn but may have been transported as a whole carcass into the environment before burial and disarticulation by burrowing organisms. (Thayer, 1985). | |
Collection methods and comments
| Collection excludes: | some macrofossils,difficult macrofossils |
| Collection methods: | bulk,acetic |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: "Disarticulated faunal elements were obtained by digesting blocks of limestone and silty limestone in a 15 percent solution of acetic acid. The insoluble residue was washed through a 28-mesh screen to remove fine material." (thayer, 1985).
UALP = University of Arizona Laboratory of Paleontology | |
Metadata
| Also known as: | UALP 7205 | ||
| Database number: | 92271 | ||
| Authorizer: | J. Mueller | Enterer: | T. Liebrecht |
| Modifier: | T. Liebrecht | Research group: | micropaleontology,vertebrate |
| Created: | 2009-11-04 10:29:34 | Last modified: | 2009-11-04 12:34:23 |
| Access level: | the public | Released: | 2009-11-04 10:29:34 |
Reference information
Primary reference:
|