| Arkadelphia Marl | |
|---|---|
| Stratigraphic range: Late Cretaceous | |
| 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 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 specimens.[5] | A bonefish. | |
| Ampheristus | A. cf. A. americanus | Cabot, Arkansas.[5] | 6 specimens.[5] | An ophidiiform. | |
| Anguilla | A.? chickasawae | Cabot, Arkansas.[5] | 6 specimens.[5] | An eel. | |
| Apateodus | A. crenellatus? | Cabot, Arkansas.[5] | 3 specimens.[5] | An aulopiform. |  |
| Arius | A.? subtilis | Cabot, Arkansas.[5] | A well-preserved specimen (DMNH 2021-09-11).[5] | A catfish. | |
| Clupeiformes? indeterminate | Indeterminate | Cabot, Arkansas.[5] | An eroded, broken specimen (DMNH 2021-09-10).[5] | A clupeiform. | |
| Echiophis | E. aff. E. semisphaeroides | Cabot, Arkansas.[5] | 11 specimens.[5] | An eel. | |
| Elopothrissus | E. sp. | Cabot, Arkansas.[5] | One specimen (DMNH 2021-09-03).[5] | A bonefish. | |
| Elops | E. sp. | Cabot, Arkansas.[5] | A small, broken specimen (DMNH 2021-09-01).[5] | A ladyfish. | _(12599083534).jpg.webp){kind=small} |
| Eutawichthys | E. maastrichtiensis | Cabot, Arkansas.[5] | 21 specimens.[5] | A beryciform. | |
| E. cf. E. stringeri | Cabot, Arkansas.[5] | 48 specimens.[5] | A beryciform. | ||
| E. zideki | Cabot, Arkansas.[5] | 287 specimens.[5] | A beryciform. | ||
| Gadiformes indeterminate | Indeterminate | Cabot, Arkansas.[5] | 11 very small or broken specimens.[5] | A gadiform. | |
| Genartina | G. sp. 1 | Cabot, Arkansas.[5] | One specimen (DMNH 2021-09-04).[5] | ||
| Kokenichthys | K. navis | Cabot, Arkansas.[5] | 2 eroded specimens.[5] | An osteoglossiform. | |
| Lapillus type 1 | Indeterminate | Cabot, Arkansas.[5] | A small, slightly eroded specimen (DMNH 2021-09-31).[5] | An unidentified fish otolith. | |
| Muraenanguilla | M.? sp. | Cabot, Arkansas.[5] | 2 worn, broken specimens.[5] | An eel. | |
| Osmeroides | O. sp. | Cabot, Arkansas.[5] | 3 specimens.[5] | ||
| Palaeogadus | P.? belli | Cabot, Arkansas.[5] | Multiple specimens.[5] | A gadiform. | |
| P. cf. P. weltoni | Cabot, Arkansas.[5] | A small, slightly eroded specimen (DMNH 2021-09-23).[5] | A gadiform. | ||
| Protobythites | P. brzobohatyi | Cabot, Arkansas.[5] | 4 specimens.[5] | An ophidiiform. | |
| Tippaha | T. mythica | Cabot, Arkansas.[5] | 8 specimens.[5] | A holocentriform. | |
| Vorishia | V. vulpes | Cabot, Arkansas.[5] | 1,537 specimens.[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
| 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
References
- ↑ McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 31. Archived from the original (PDF) on 2016-12-21. 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". Archived from the original on 2016-08-19. Retrieved 2016-07-31.
- ↑ "Arkadelphia Marl (ARKad;0)".
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 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.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 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.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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