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Full-Text Articles in Physical Sciences and Mathematics
Paleoceanography And Paleoenvironmental Changes Of The Cenomanian-Turonian Boundary Interval (94-93 Ma): The Record Of Oceanic Anoxic Event 2 In The Central And Eastern Parts Of The Western Interior Sea, Khalifa Elderbak
Doctoral Dissertations
The Cenomanian/Turonian (C/T) boundary marine strata of the Late Cretaceous Western Interior Sea (WIS) exhibit a positive carbon isotopic excursion in the bulk-carbonate and organic carbon. This marks Oceanic Anoxic Event 2 (OAE 2), which spans the uppermost part of the Hartland Shale and one-third of the overlying Bridge Creek Limestone members of the Greenhorn Formation and their equivalents. The interval is characterized by alternating beds of light-colored limestone and dark-colored marlstone and calcareous shale. These lithologic couplets have been related to Milankovitch orbital cyclicity. Foraminiferal assemblages from three selected sites, including the C/T boundary Global Boundary Stratotype Section and …
Remarkable Preservation Of A New Genus And Species Of Limuline Horseshoe Crab From The Cretaceous Of Texas, U.S.A., Rodney Feldman, Carrie Schweitzer, Benjamin Dattilo, James Farlow
Remarkable Preservation Of A New Genus And Species Of Limuline Horseshoe Crab From The Cretaceous Of Texas, U.S.A., Rodney Feldman, Carrie Schweitzer, Benjamin Dattilo, James Farlow
Benjamin F. Dattilo
A single specimen, part and counterpart of a carapace, of a horseshoe crab from the Lower Cretaceous (Albian) Glen Rose Formation in north-central Texas, forms the basis for the definition of a new genus and species, Crenatolimulus paluxyensis. The discovery represents only the fifth limuline known from the Cretaceous. Its preservational style is remarkable in that the carapace exterior is faithfully replicated by a massive overgrowth of serpulid worms.