Pelecypoda from the lower Fox Hills Formation (Upper Cretaceous) of Emmons County, North Dakota

The Fox Hills Formation in Emmons County, North Dakota, consists of 250-350 feet of medium to fine grained sand and sandstone with some shale interbeds. In Emmons County, the four members, Trail City, Timer Lake, Bullhead(?), and Colgate are not as distinct lithologically as they are in the areas from which they were described; thus, the unit has been subdivided into a lower part consisting of crossbedded sand and sandstone with calcareous, fossiliferous concretions and an upper part consisting of interbeds of buff sand and chocolate shale. The gradational change from Pierre Shale lithology to the sands of the overlying Fox Hills Formation have resulted in several different definitions of the contact. The most consistent criterion for defining the contact in Emmons County is a zone of jaresite below the lowest fossiliferous concretion layer. The base of the jaresite zone has been arbitrarily selected as the division between the two formations. Twenty-two species of pelecypoda were identified from the concretions of the lower part of the formation. The concretions were probably formed as clay boulders along the strand line of the Fox Hills Sea and were later transported to their site of deposition further offshore. The entire formation represents the shoreline and nearshore facies of the regressive Upper Cretaceous seaway

Bivalvia and paleoecology of the Fox Hills Formation (Upper Cretaceous) of North Dakota

The bivalve fauna of the Fox Hills Formation, Maestrichtian, of North Dakota was studied in an attempt to modernize the nomenclature of known bivalves, describe new forms, interpret the relationships of members of the formation, and establish the paleoecological setting in which the Fox Hills was deposited. The Fox Hills Formation crops out in Logan, Emmons, Sioux, Morton, Burleigh, Kidder, Pierce, McHenry, Bottineau, and Bowman counties in North Dakota. It is best exposed along the Missouri River in south-central North Dakota. Traditionally, the formation has been subdivided into four members, all of which are exposed in the type area of the formation in north-central South Dakota. In North Dakota, however, the lowermost Trail City Member cannot be lithologically recognized and, therefore, only the Timber Lake, Bullhead, and Colgate members, in ascending order, have been recognized. Lithologically, the Timber Lake Member consists of medium- to fine-grained sandstone, which is either uncon solidated or loosely cemented. This unit becomes increasingly crossbedded toward the top. \u27TIie Bullhead Member consists of a sequence of intercalated sandstone and shale which is essentially devoid of bivalves. The uppermost member, the Colgate, consists of light colored greywacke sandstone. Forty-two species of bivalves were identified from the Fox Hills Formation in North Dakota and arranged in twenty-five genera. This number included three new species, Nucula enunonsensis, Modiolus siouxensis, and ?Astarte hollandi. Three other species which are characteristic of the Creta ceo~s of the Eastern Seaboard were identified for the first time from the Midcontinent. Using ecological data derived by studying the ecology of recent bivalves of the same genera as those collected in the Fox Hills Formation and the sedimentologic data, it was concluded that the Fox Hills Formation in North Dakota represents the littoral and shallow subtidal margin of the retreating Cretaceous epicontinental seaway. Data from the bivalves indicated that, in general, water depth decreased from about 80 fathoms to O fathoms from the base of the formation to the top, an observation which is further stren gthened by sedimentologic evidence. These data in conjunction with those derived from the presence of a volcanic ash bed occurring in several parts of Emmons, Sioux, and Morton counties, which transcends the member boundaries, indicate that the members were being deposited penecontemporaneously across central North Dakota. At the time that the strand line, now represented by the Fox Hills-Hell Creek boundary, occupied the area of central Sioux County, the Pierre-Fox Hills bondary would have occupied an area in central Emmons County forty miles to the east. Deposition 0£ the Timber Lake Member was normal marine whereas that in the area of Bullhead deposition was apparently brackish, probably as a result of restriction caused by development of barriers in the area of the upper Timber Lake Member. The Colgate Member represents the strand line of the Fox Hills seaway

A new Triassic decapod, Platykotta akaina , from the Arabian shelf of the northern United Arab Emirates: earliest occurrence of the Anomura

A Triassic decapod crustacean is described here for the first time from the Norian-Rhaetian Ghalilah Formation of the Musandam Peninsula, United Arab Emirates. The single specimen Platykotta akaina n. gen n. sp. is referred to a new family Platykottidae. The studied crustacean, initially with only the ventral exposure preserved, was collected from shallow-water, burrowed limestones. Using a chemical preparation, the dorsal view revealed a well-preserved, chitinous, granular carapace exhibiting characteristic carapace morphology and groove pattern of the Eocarcinoidea, the superfamily to which the new family is assigned. The dorsal view together with the ventral surface, rarely seen in the fossil record, provide new insight into the morphology of representatives of the Eocarcinoide

Industrial Resources - Fulton County - Fulton

Resources for Economic Development: Fulton County, Kentucky” prepared by the Kentucky Department of Economic Development, Division of Research, and the Fulton County Economic Development Partnership, 1995. The report includes, but is not limited to, information about: population, labor market, local manufacturing, transportation, utilities, fuel, water, sewage, industrial sites, local government and services, taxes, educational and health facilities, housing, communication, recreation, natural resources, markets, and climate

Eocene decapod crustacea (thalassinidea and brachyura) from Patagonia, Argentina

Rocks of the Rio Turbio Formation, exposed in southern Patagonia, Argentina, represent one of very few occurrences of Eocene rocks in the region. Decapod crustaceans collected from the unit include one species of thalassinidean mud shrimp; Turbiocheir minutospinata, new genus, new species; and three species of brachyurans; Raninoides rioturbiensis, new species; Megokkos patagoniensis, new species; and Nitotacarcinus antipodes, new species. The three brachyuran genera are also known from species in the Northeast Pacific, suggesting an amphitropical distributional pattern.Fil: Schweitzer, Carrie E.. Kent State University; Estados UnidosFil: Feldmann, Rodney M.. Kent State University; Estados UnidosFil: Casadio, Silvio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; ArgentinaFil: Rodriguez Raising, Martin Eduardo. Universidad Nacional de La Pampa; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

New Decapoda (Crustacea) from the Middle and Late Eocene of Pakistan and a revision of Lobonotus A. Milne Edwards, 1864

p. 89-118http://deepblue.lib.umich.edu/bitstream/2027.42/41256/2/C31-4.pd

Redescription of Americlus rankini (Woodward, 1868) (Pancrustacea: Cyclida: Americlidae) and interpretation of its systematic placement, morphology, and paleoecology

The best-preserved Scottish species of a cyclidan is reinterpreted, based upon recent advances in cyclidan paleobiology. Americlus rankini (Woodward, 1868) is one of the best-preserved members of this crustacean group, and its morphology suggests that it and related forms exhibited a unique and distinct morphology within Multicrustacea. Paleoecological evidence suggests that the animal was most likely free living, possibly as a scavenger, in a marginal marine environment. Americlus lived in Laurentia during the Middle Mississippian (Visean) to Middle Pennsylvanian (Moscovian)