Arkadelphia Marl

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Arkadelphia Marl
Stratigraphic range: Late Cretaceous
Type Formation
Underlies Midway Group
Overlies Nacatoch Formation
Thickness120 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.

Contents

Paleofauna

Bony fish

Bony fish reported from the Arkadelphia Formation
GenusSpeciesPresenceMaterialNotesImages
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.
Apateodus corneti Naturalis.JPG
Arius A.? subtilis Cabot, Arkansas. [5] A well-preserved specimen (DMNH 2021-09-11). [5] A catfish.
Clupeiformes? indeterminateIndeterminate 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.
Elops saurus (S0968) (12599083534).jpg
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 indeterminateIndeterminate 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 1Indeterminate 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
GenusSpeciesPresenceMaterialNotesImages
Dasyatis D. sp. Ouachita River northwest of Malvern, Arkansas. [6] 3 oral teeth (AMNH 20194-20196) [6] A stingray.
Dasyatis sabina SI3.jpg
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.
Ischyrhiza mira.jpg
Ptychotrygon P. cf. P. vermiculata Ouachita River northwest of Malvern, Arkansas. [6] 4 oral teeth (AMNH 20183-20186). [6] A sawskate.
Ptychotrygon sp.jpg
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.
Schizorhiza restoration.png
Sclerorhynchus S. sp. Ouachita River northwest of Malvern, Arkansas. [6] 3 rostral teeth (AMNH 20175-20177). [6] A sawskate.
Sclerorhynchus lebanon.jpg

Sharks

Sharks reported from the Arkadelphia Formation
GenusSpeciesPresenceMaterialNotesImages
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.
Serratolamna serrata.JPG
Squalicorax S. kaupi Ouachita River northwest of Malvern, Arkansas. [6] 6 lateral teeth (AMNH 20150-10155). [6] A mackerel shark.
MenuhaSqualicoraxKaupi.jpg
Squatina S. hassei Ouachita River northwest of Malvern, Arkansas. [6] 4 lateral teeth (AMNH 20128-20131). [6] An angelshark.

See also

Related Research Articles

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References

  1. ↑ 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.
  2. ↑ Hill, R.T. (1888). "The Neozoic geology of southwestern Arkansas". Arkansas Geological Survey Annual Report 1888. 2: 33, 39, 53–56, 72, 188.
  3. ↑ "ARKADELPHIA MARL/FORMATION". Archived from the original on 2016-08-19. Retrieved 2016-07-31.
  4. ↑ "Arkadelphia Marl (ARKad;0)".
  5. 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.
  6. 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.


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