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Heteromorph ammonites from the Upper Campanian (Upper Cretaceous) Baculites cuneactus and Baculites reesidei zones of the Pierre Shale in Colorado, USA

Kennedy W., Cobban W., Scott G.

Acta Geologica Polonica

2000

Vol. 50, no. 1

1-20

Calcareous sandstone concretions in the Upper Cretaceous Pierre Shale in Middle Park and in the Fort Collins area of Colorado in the U.S. Western Interior contain heteromorph ammonites of the families Nostoceratidae HYATT, 1894, and Diplomoceratidae SPATH 1926. The following species are described: Nostoceras cf. N. approximans (CONRAD 1855), Nostoceras cf. N. obtusum HOWARTH 1965, N. larimerense sp. nov., Nostoceras cf. N. splendidum (SHUMARD 1861) Didymoceras aurarium sp. nov., D. draconis (STEPHENSON 1941) Cirroceras conradi (MORTON 1841), Anaklinoceras minutum sp. nov., Solenoceras texanum (SHUMARD 1861), Solenoceras cf. S. reesidei STEPHENSON 1941, Lewyites oronensis (LEWY 1969) and Lewyites? sp. All these species are migrants from the Gulf coastal region. Didymoceras draconis and Cirroceras conradi are also known from the Delaware - New Jersey area and these two species, together with Solenoceras texanum are known from as far away as Israel

Heteromorph ammonites from the middle Campanian Baculites scotti Zone in the U.S. Western Interior

Kennedy W., Cobban W., Scott G.

Acta Geologica Polonica

2000

Vol. 50, no. 2

223-241

The occurrence of organic soil cover in river valleys is typical regions that were to areal deglaciation. This feature results from the adaptation of a series of linear depressions of glacial melt-out origin by rivers for their flow. Such a series of depressions, primarily composing overflow lakes, underwent subsequent infilling with mainly lake and marsh deposits. These very thick deposits, characterised by high sorption potential and developed in the form of continuous structures, can be considered as effective protection layers, isolating groundwater from contamination