Arkadelphia Marl
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.
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 |
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. | ![]() |
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. | |
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)".
- 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.
- Becker, Martin A.; Chamberlain Jr, John A.; Wolf, George E. (2006). "Chondrichthyans from the Arkadelphia Formation (Upper Creataceous: 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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