Table 2. Comparison of the otoliths (taxa and percentage of total) of the Fox Hills Formation (NDGS 5597 locality, near Burnstad, North Dakota, USA), Kemp Clay (South Sulphur River, near Commerce, Texas, USA), and Ripley Formation (near Blue Springs, Mississippi, USA) based on bulk samples. 1 includes specimens identified as Pterothrissus cf. P. conchaeformis, 2 includes specimens identified as Ampheristus cf. A. americanus. Order=FORMES, Family=idae
| Taxa in Fox Hill., Kemp Clay, and |
Fox Hills Fm., North Dakota |
Kemp Clay, Texas |
Ripley Fm., Mississippi |
| Ripley formation sites |
No. of otoliths |
% of total |
No. of otoliths |
% of total |
No. of otoliths |
% of total |
| Megalopidae |
| Megalops? nolfi |
0 |
0 |
0 |
0 |
3 |
0.40 |
| Albulidae |
| Albula cf. A. bashiana |
0 |
0 |
7 |
0.58 |
0 |
0 |
| Pollerspoeckia sp. |
4 |
1.50 |
0 |
0 |
0 |
0 |
| Pterothrissus conchaeformis 1 |
0 |
0 |
113 |
9.33 |
6 |
0.81 |
| Pterothrissus cf. P. foreyi |
0 |
0 |
2 |
0.17 |
0 |
0 |
| Albula sp. |
0 |
0 |
0 |
0 |
7 |
0.94 |
| Elopothrissus sp. |
0 |
0 |
0 |
0 |
0 |
0 |
| ORDER INDETERMINATE |
| Genartina sp. |
0 |
0 |
3 |
0.25 |
0 |
0 |
| Osmeroididae |
| Osmeroides mississippiensis |
0 |
0 |
0 |
0 |
14 |
1.89 |
| Osmeroides sp. |
0 |
0 |
0 |
0 |
4 |
0.53 |
| Anguillidae |
| Anguilla chickasawae |
0 |
0 |
0 |
0 |
2 |
0.27 |
| Ophichthidae |
| Echiophis aff. E.semispaeroides |
0 |
0 |
2 |
0.17 |
0 |
0 |
| Family Ind. (ANGUILLIFORMES) |
| Muraenanguilla cf. M. unionensis |
0 |
0 |
0 |
0 |
19 |
2.56 |
| Heterenchelyidae |
| Pythonichthys arkansasensis |
0 |
0 |
3 |
0.25 |
0 |
0 |
| Congridae |
| Rhynchoconger? piger |
0 |
0 |
38 |
3.14 |
0 |
0 |
| Rhynchoconger brettwoodwardi |
0 |
0 |
25 |
2.06 |
0 |
0 |
| Congrophichthys transterminus |
0 |
0 |
3 |
0.25 |
0 |
0 |
| Family ind. (OSTEOGLOSSIFORMES) |
| Kokenichthys navis |
0 |
0 |
0 |
0 |
7 |
0.94 |
| Kokenichthys ripleyensis |
0 |
0 |
0 |
0 |
1 |
0.13 |
| Family Ind. (CLUPEIFORMES) |
| Clupeiform indeterminate |
0 |
0 |
0 |
0 |
0 |
0 |
| Ariidae |
| Arius? danicus |
0 |
0 |
67 |
5.53 |
0 |
0 |
| Arius? subtilis |
0 |
0 |
195 |
16.10 |
13 |
1.75 |
| No. of otoliths |
% of total |
No. of otoliths |
% of total |
No. of otoliths |
% of total |
| Family Ind. (SILURIFORMES) |
| Vorhisia vulpes |
78 |
29.32 |
423 |
34.93 |
2 |
0.27 |
| Ichthyotringidae |
| Apateodus crennelatus? |
0 |
0 |
0 |
0 |
42 |
5.66 |
| Thrax acutus |
0 |
0 |
0 |
0 |
1 |
0.13 |
| Ichthyotringa? tavernei |
0 |
0 |
0 |
0 |
4 |
0.53 |
| Paraulopidae |
| Paraulopus pseudoperca |
0 |
0 |
4 |
0.33 |
190 |
25.61 |
| Family Ind. (ORDER UNKNOWN) |
| Choctawichthys ceploides |
0 |
0 |
0 |
0 |
2 |
0.27 |
| Polymixiidae |
| Cowetaichtys carnevalei |
0 |
0 |
0 |
0 |
3 |
0.40 |
| Cowetaichthys alabamae |
0 |
0 |
0 |
0 |
9 |
1.21 |
| Merlucciidae |
| Paleogadus weltoni |
0 |
0 |
2 |
0.17 |
0 |
0 |
| Palaeogadus belli |
0 |
0 |
0 |
0 |
0 |
0 |
| Gadidae? |
| Dakotaichthys hogansoni |
177 |
66.29 |
16 |
1.32 |
0 |
0 |
| Family Ind. (GADIFORMES) |
| Archaemacruroides bratishkoi |
0 |
0 |
11 |
0.91 |
0 |
0 |
| GADIFORMES Ind. |
0 |
0 |
0 |
0 |
0 |
0 |
| Family Ind. (HOLOCENTRIFORMES) |
| Tippaha mythica |
0 |
0 |
0 |
0 |
1 |
0.13 |
| Tippaha cavata |
0 |
0 |
0 |
0 |
1 |
0.13 |
| Trachichthyidae |
| Hoplopteryx oscitans |
0 |
0 |
0 |
0 |
278 |
37.47 |
| Hoplopteryx langfordi |
0 |
0 |
0 |
0 |
11 |
1.48 |
| Hoplostethus stringeri |
0 |
0 |
52 |
4.29 |
0 |
0 |
| Berycidae |
| Centroberyx apogoniformis |
0 |
0 |
42 |
3.47 |
0 |
0 |
| Family Ind. (BERYCIFORMES) |
| Argyroberyx? dentatus |
0 |
0 |
1 |
0.08 |
0 |
0 |
| Argyroberyx? dockeryi |
0 |
0 |
0 |
0 |
2 |
0.27 |
| Ripley formation sites |
No. of otoliths |
% of total |
No. of otoliths |
% of total |
No. of otoliths |
% of total |
| Family Ind. (BERYCIFORMES) |
| Eutawichthys cf. E. choctawae |
0 |
0 |
7 |
0.58 |
0 |
0 |
| Eutawichthys maastrichtiensis |
8 |
3.00 |
2 |
0.17 |
15 |
2.02 |
| Eutawichthys zideki 2 |
0 |
0 |
0 |
0 |
24 |
3.23 |
| Eutawichthys stringeri |
0 |
0 |
0 |
0 |
0 |
0 |
| Family Ind. (BERYCIFORMES) |
| Ossulcus labiatus |
0 |
0 |
0 |
0 |
3 |
0.40 |
| Ophidiidae |
| Ampheristus americanus 2 |
0 |
0 |
130 |
10.73 |
0 |
0 |
| Bythitidae |
| Bidenichthys? crepidatus |
0 |
0 |
2 |
0.17 |
0 |
0 |
| Protobythites brzobohatyi |
0 |
0 |
1 |
0.08 |
0 |
0 |
| Pempheridae |
| Pempheris? huddlestoni |
0 |
0 |
0 |
0 |
29 |
3.91 |
| Serranidae |
| Serranus? caribbaeus |
0 |
0 |
12 |
0.99 |
0 |
0 |
| Serranus? severnensis |
0 |
0 |
0 |
0 |
1 |
0 |
| Incertae sedis |
| Otolithopsis cumatilis |
0 |
0 |
0 |
0 |
4 |
0.54 |
| Percoid sp. |
0 |
0 |
0 |
0 |
3 |
0.40 |
| ORDER/Family unknown |
| Lapillus type 1 |
0 |
0 |
0 |
0 |
7 |
0.94 |