Earth:Arkadelphia Marl
From HandWiki
| Arkadelphia Marl Stratigraphic range: Late Maastrichtian | |
|---|---|
| Type | Formation |
| Underlies | Midway Group |
| Overlies | Nacatoch Formation |
| Thickness | 120 to 160 feet[1] |
| Location | |
| Region | Arkansas |
| Country | United States |
| Type section | |
| Named for | Arkadelphia, Clark County, Arkansas[2] |
| Named by | Robert Thomas Hill |
The Arkadelphia Marl, also called the Arkadelphia Formation, is a geologic formation in Arkansas in Clark, Nevada, and Hempstead counties.[3][4] It preserves fossils dating back to the late Maastrichtian stage of the Cretaceous period.
Paleofauna
Bony fish
| Bony fish reported from the Arkadelphia Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Albulidae indet. | Indeterminate | Cabot, Arkansas.[5] | 4 small, eroded otoliths.[5] | A bonefish. | |
| Ampheristus | A. cf. A. americanus | Cabot, Arkansas.[5] | 6 otoliths.[5] | An ophidiiform. | |
| Anguilla | A.? chickasawae | Cabot, Arkansas.[5] | 6 otoliths.[5] | An eel. | |
| Apateodus | A. crenellatus? | Cabot, Arkansas.[5] | 3 otoliths.[5] | An aulopiform. |  |
| Arius | A.? subtilis | Cabot, Arkansas.[5] | A well-preserved otolith (DMNH 2021-09-11).[5] | A catfish. | |
| Clupeiformes? indeterminate | Indeterminate | Cabot, Arkansas.[5] | An eroded, broken otolith (DMNH 2021-09-10).[5] | A clupeiform. | |
| Echiophis | E. aff. E. semisphaeroides | Cabot, Arkansas.[5] | 11 otoliths.[5] | An eel. | |
| Elopothrissus | E. sp. | Cabot, Arkansas.[5] | One otolith (DMNH 2021-09-03).[5] | A bonefish. | |
| Elops | E. sp. | Cabot, Arkansas.[5] | A small, broken otolith (DMNH 2021-09-01).[5] | A ladyfish. | _(12599083534).jpg) |
| Eutawichthys | E. maastrichtiensis | Cabot, Arkansas.[5] | 21 otoliths.[5] | A beryciform. | |
| E. cf. E. stringeri | Cabot, Arkansas.[5] | 48 otoliths.[5] | A beryciform. | ||
| E. zideki | Cabot, Arkansas.[5] | 287 otoliths.[5] | A beryciform. | ||
| Gadiformes indeterminate | Indeterminate | Cabot, Arkansas.[5] | 11 very small or broken otoliths.[5] | A gadiform. | |
| Genartina | G. sp. 1 | Cabot, Arkansas.[5] | One otolith (DMNH 2021-09-04).[5] | ||
| Kokenichthys | K. navis | Cabot, Arkansas.[5] | 2 eroded otoliths.[5] | An osteoglossiform. | |
| Lapillus type 1 | Indeterminate | Cabot, Arkansas.[5] | A small, slightly eroded otolith (DMNH 2021-09-31).[5] | An unidentified fish otolith. | |
| Muraenanguilla | M.? sp. | Cabot, Arkansas.[5] | 2 worn, broken otoliths.[5] | An eel. | |
| Osmeroides | O. sp. | Cabot, Arkansas.[5] | 3 otoliths.[5] | ||
| Palaeogadus | P.? belli | Cabot, Arkansas.[5] | Multiple otoliths.[5] | A gadiform. | |
| P. cf. P. weltoni | Cabot, Arkansas.[5] | A small, slightly eroded otolith (DMNH 2021-09-23).[5] | A gadiform. | ||
| Protobythites | P. brzobohatyi | Cabot, Arkansas.[5] | 4 otoliths.[5] | An ophidiiform. | |
| Tippaha | T. mythica | Cabot, Arkansas.[5] | 8 otoliths.[5] | A holocentriform. | |
| Vorishia | V. vulpes | Cabot, Arkansas.[5] | 1,537 otoliths.[5] | A catfish. | |
Rays
| Rays reported from the Arkadelphia Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Dasyatis | D. sp. | Ouachita River northwest of Malvern, Arkansas.[6] | 3 oral teeth (AMNH 20194-20196) [6] | A stingray. |  |
| Ischyrhiza | I. avonicola | Ouachita River northwest of Malvern, Arkansas.[6] | 8 teeth (AMNH 20164-20171).[6] | A sawskate. | |
| I. mira | Ouachita River northwest of Malvern, Arkansas.[6] | 3 oral teeth (AMNH 20172-20174).[6] | A sawskate. |  | |
| Ptychotrygon | P. cf. P. vermiculata | Ouachita River northwest of Malvern, Arkansas.[6] | 4 oral teeth (AMNH 20183-20186).[6] | A sawskate. |  |
| Raja | R. farishi | Ouachita River northwest of Malvern, Arkansas.[6] | 3 oral teeth (AMNH 20187-20189).[6] | A skate. | |
| Rhinobatos | R. casieri | Ouachita River northwest of Malvern, Arkansas.[6] | 4 oral teeth (AMNH 20160-20163).[6] | A guitarfish. | |
| Rhombodus | R. binkhorsti | Ouachita River northwest of Malvern, Arkansas.[6] | 4 oral teeth (AMNH 20190-20193) [6] | A rajiforme. | |
| Schizorhiza | S. cf. S. stromeri | Ouachita River northwest of Malvern, Arkansas.[6] | 5 rostral teeth (AMNH 20178-20182).[6] | A sawskate. |  |
| Sclerorhynchus | S. sp. | Ouachita River northwest of Malvern, Arkansas.[6] | 3 rostral teeth (AMNH 20175-20177).[6] | A sawskate. |  |
| Sharks reported from the Arkadelphia Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Carcharias | C. cf. C. holmdelensis | Ouachita River northwest of Malvern, Arkansas.[6] | 5 anterior teeth (AMNH 20139-20143).[6] | A sand shark. | |
| Galeorhinus | G. girardoti | Ouachita River northwest of Malvern, Arkansas.[6] | 4 lateral teeth (AMNH 20156-20159). | A houndshark. | |
| Ginglymostoma | G. lehneri | Ouachita River northwest of Malvern, Arkansas.[6] | 4 lateral teeth (AMNH 20132-20135).[6] | A carpet shark. | |
| Odontaspis | O. aculeatus | Ouachita River northwest of Malvern, Arkansas.[6] | 2 lateral teeth (AMNH 20137 & 20138).[6] | A sand shark. | |
| Plicatoscyllium | P. cf. P. derameei | Ouachita River northwest of Malvern, Arkansas.[6] | Lateroanterior tooth (AMNH 20136).[6] | A carpet shark. | |
| Serratolamna | S. serrata | Ouachita River northwest of Malvern, Arkansas.[6] | 6 teeth (AMNH 20144-20149).[6] | A mackerel shark. |  |
| Squalicorax | S. kaupi | Ouachita River northwest of Malvern, Arkansas.[6] | 6 lateral teeth (AMNH 20150-10155).[6] | A mackerel shark. |  |
| Squatina | S. hassei | Ouachita River northwest of Malvern, Arkansas.[6] | 4 lateral teeth (AMNH 20128-20131).[6] | An angelshark. | |
See also
- List of fossiliferous stratigraphic units in Arkansas
- Paleontology in Arkansas
References
- ↑ McFarland, John David (2004). "Stratigraphic summary of Arkansas". Arkansas Geological Commission Information Circular 36: 31. http://geology.ar.gov/pdf/IC-36_v.pdf. Retrieved 2018-01-12.
- ↑ Hill, R.T. (1888). "The Neozoic geology of southwestern Arkansas". Arkansas Geological Survey Annual Report 1888 2: 33,39,53–56,72,188.
- ↑ "ARKADELPHIA MARL/FORMATION". http://www.geology.ar.gov/geology/kad.htm.
- ↑ "Arkadelphia Marl (ARKad;0)". http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=ARKad;0.
- ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 5.12 5.13 5.14 5.15 5.16 5.17 5.18 5.19 5.20 5.21 5.22 5.23 5.24 5.25 5.26 5.27 5.28 5.29 5.30 5.31 5.32 5.33 5.34 5.35 5.36 5.37 5.38 5.39 5.40 5.41 5.42 5.43 5.44 5.45 Stringer, Gary L.; Sloan, James Carson (2023-05-25). "First Cretaceous teleostean otolith assemblage (Arkadelphia Formation, upper Maastrichtian) from Arkansas, USA, early Gadiformes, and the Western Interior Seaway". PaleoBios 40 (3). doi:10.5070/P940361192. ISSN 2373-8189. https://escholarship.org/uc/item/6zt71586.
- ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 6.23 6.24 6.25 6.26 6.27 6.28 6.29 6.30 6.31 6.32 Becker, Martin A.; Chamberlain Jr, John A.; Wolf, George E. (2006). "Chondrichthyans from the Arkadelphia Formation (Upper Cretaceous: Upper Maasstrichtian) of Hot Spring County, Arkansas". Journal of Paleontology 80 (4): 700–716. https://www.researchgate.net/publication/250071119.
- ((Various Contributors to the Paleobiology Database)). "Fossilworks: Gateway to the Paleobiology Database". https://www.fossilworks.org.
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