MGS Loc. 90 - Ichusa Creek [Mint Spring Fm]: Rupelian, Mississippi

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Amonia microstriata
2 individuals
R category
Fustaria sp.
MacNeil and Dockery 1984
Fustaria menthifonta n. sp.
MacNeil and Dockery 1984
Bivalvia - Mytilida - Crenellidae
Crenella fenestra n. sp. Dockery 1982
21 individuals
C category
Bivalvia - Arcida - Glycymerididae
Glycymeris intercostata (Gabb 1860)
10 individuals
C category
Glycymeris suwannensis Mansfield 1937
18 individuals
C category
Bivalvia - Arcida - Arcidae
Scapharca delicatula (Casey 1903)
11 individuals
C category
Bivalvia - Pectinida - Pectinidae
Eburneopecten subminutus (Aldrich 1903)
20 individuals
recombined as Eburneopecten (Eburneopecten) subminutus
C category
Chlamys menthifontis Glawe 1970
5 individuals
recombined as Chlamys (Lyropecten) menthifontis
R category
Bivalvia - Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758
1 individual
R category
Ostrea paroxis Lesueur 1829
2 individuals
R category
Bivalvia - Lucinida - Lucinidae
Myrtea vicksburgensis (Casey 1903)
54 individuals
C category
Lucina posteocurta n. sp. Dockery 1982
9 individuals
R category
Lucina imbricolamella n. sp. Dockery 1982
27 individuals
C category
Bivalvia - Pholadida - Corbulidae
Corbula engonata Conrad 1848
12 individuals
C category
Corbula laqueata Casey 1903
63 individuals
recombined as Varicorbula laqueata
C category
Bivalvia - Cardiida - Ungulinidae
Diplodonta eburnea (Conrad 1848)
8 individuals
recombined as Diplodonta (Diplodonta) eburnea
R category
Bivalvia - Cardiida - Kelliellidae
Kelliella rufaripa n. sp.
3 individuals
R category
Bivalvia - Cardiida - Veneridae
Pitar calcanea
7 individuals
R category
Pitar aldrichi n. sp.
10 individuals
C category
Chione victoria (Dall 1982)
3 individuals
recombined as Lirophora (Lirophora) victoria
R category
Bivalvia - Cardiida - Cardiidae
Laevicardium leptorimum n. sp. Dockery 1982
1 individual
R category
Trachycardium eversum (Conrad 1848)
1 individual
R category
Agnocardia glebosum (Conrad 1848)
1 individual
R category
Nemocardium diversum (Conrad 1848)
1 individual
recombined as Nemocardium (Nemocardium) diversum
R category
Trigoniocardia silvacollina n. sp. Dockery 1982
1 individual
R category
Bivalvia - Cardiida - Tellinidae
Tellina subprotexta n. sp.
57 individuals
C category
Bivalvia - Cardiida - Semelidae
Ervilia exterolaevis n. sp.
1 individual
R category
Semelina pilsbryi
2 individuals
R category
Bivalvia - Cardiida - Sportellidae
Sportella oblonga (Conrad 1848)
4 individuals
R category
Bivalvia - Hiatellida - Hiatellidae
Panopea oblongata Conrad 1848
1 individual
R category
Bivalvia - Poromyida - Verticordiidae
Verticordia dalliana
29 individuals
C category
Bivalvia - Poromyida - Cuspidariidae
Plectodon intastriata
5 individuals
R category
Bivalvia - Poromyida - Spheniopsidae
Spheniopsis mississippiensis
13 individuals
C category
Bivalvia - Carditida - Carditidae
Venericardia carsonensis Dall 1903
42 individuals
recombined as Venericardia (Rotundicardia) carsonensis
C category
Bivalvia - Carditida - Astartidae
Astarte menthifontis n. sp. Dockery 1982
42 individuals
C category
Bivalvia - Nuculida - Nuculidae
Nucula vicksburgensis Conrad 1848
16 individuals
C category
Scaphopoda - Dentaliida - Dentaliidae
Dentalium opaculum
MacNeil and Dockery 1984
Gastropoda - Lepetellida - Lepetellidae
Sablea minuta
MacNeil and Dockery 1984
Gastropoda - Vermetidae
Serpulorbis sp. Sasso 1827
MacNeil and Dockery 1984
Gastropoda - Neogastropoda - Costellariidae
Conomitra vicksburgensis
MacNeil and Dockery 1984
Conomitra vicksburgensis laevigata
Conomitra crenulata
MacNeil and Dockery 1984
Conomitra crenulata modesta
Microsurcula mentha n. sp.
MacNeil and Dockery 1984
Gastropoda - Neogastropoda - Olivellidae
Oliva mississippiensis Conrad 1848
MacNeil and Dockery 1984
recombined as Agaronia mississippiensis
Gastropoda - Neogastropoda - Borsoniidae
Microdrillia vicksburgella
MacNeil and Dockery 1984
Gastropoda - Neogastropoda - Cochlespiridae
Tropiscurcula caseyi
MacNeil and Dockery 1984
original and current combination Tropisurcula
Gastropoda - Neogastropoda - Cancellariidae
Olssonella elongata n. sp.
MacNeil and Dockery 1984
replaced by Axelella
Agatrix mississippiensis
MacNeil and Dockery 1984
Gastropoda - Heterostropha - Acteonidae
Acteon menthafons n. sp.
MacNeil and Dockery 1984
Acteon punctatus n. sp.
MacNeil and Dockery 1984
unclassified
Tellina lintea Conrad 1837
1 individual
synonym of Tellina (Merisca) aequistriata
R category
see common names

Geography
Country:United States State/province:Mississippi County:Smith
Coordinates: 32.0° North, 89.4° West (view map)
Paleocoordinates:32.3° North, 82.9° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Oligocene
Stage:Rupelian 10 m.y. bin:Cenozoic 4
*Period:Early/Lower Tertiary *Epoch:Early/Lower oligocene
*International age/stage:Early/Lower Rupelian - Early/Lower - Middle Rupelian
Key time interval:Rupelian
Age range of interval:33.90000 - 27.82000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Mint Spring
Stratigraphic resolution:formation
Stratigraphy comments: The Mint Spring Formation consists of fossiliferous sands that lie disconformably above the estuarine clays and sands of the Forest Hill Formation. This contact is characterized by shell gravels that are largely comprised of the bivalve "Callista", by lithified clay clasts bored by the bivalve "Jouannetia", and by shark and ray teeth. Lithified clay clasts are especially common at the base of the Mint Spring Formation along the Chickasawhay River in Wayne County. Here clay clasts are numerous enough to have produced a cobble bottom on the Mint Spring sea floor. These clasts formed a hard substrate utilized by a variety of encrusting organisms. The sands of the Mint Spring are moderately clean and often show cross-bedding. These sands indicate a near-shore shelf enviroment. At localities 89 and 90 in Smith County these marine sand facies have well-preserved fossils.
Lithology and environment
Primary lithology: poorly lithified conglomeratic,calcareous "limestone"
Secondary lithology: wackestone
Includes fossils?Y
Includes fossils?Y
Environment:offshore Tectonic setting:passive margin
Taphonomy
Modes of preservation:body,original aragonite,original calcite
Size of fossils:mesofossils
Collection methods and comments
Collection excludes:all microfossils,some macrofossils,difficult macrofossils
Collection methods:bulk,mechanical,field collection
Reason for describing collection:taxonomic analysis
Collection method comments: bivalves only.
Taxonomic list comments:list uses catagories. For example, R = rare, 9 valves or less. C = common, 10-99 valves. A = abundant,100+ valves collected.

Categories are listed in the comments field, absolute abundances are given in the abundance field.
Since taxa with greater than 99 specimens were not counted with absolute abundances, these were reported with category "A" for abundant.
Metadata
Database number:5941
Authorizer:L. Ivany Enterer:S. DeLong
Modifier:A. Hendy Research group:GCP,marine invertebrate
Created:2000-01-01 19:05:30 Last modified:2014-08-21 11:48:40
Access level:the public Released:2000-01-01 19:05:30
Creative Commons license:CC BY
Reference information

Primary reference:

323. D. T. Dockery. 1982. Lower Oligocene Bivalvia of the Vicksburg Group in Mississippi. Mississippi Department of Natural Resources Bureau of Geology 123:1-261 [L. Ivany/S. DeLong/M. Uhen]

Secondary references:

447 F. S. MacNeil and D. T. Dockery. 1984. Lower Oligocene Gastropoda, Scaphopoda, and Cephalopoda of the Vicksburg Group in Mississippi. Mississippi Department of Natural Resources, Bureau of Geology Bulletin 124:1-415 [L. Ivany/E. Kowalski/P. Wagner]