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Articles 1 - 4 of 4
Full-Text Articles in Paleobiology
7700 Years Of Holocene Climatic Variability In Sermilik Valley, Southeast Greenland Inferred From Lake Sediments, Samuel H. Davin
7700 Years Of Holocene Climatic Variability In Sermilik Valley, Southeast Greenland Inferred From Lake Sediments, Samuel H. Davin
Masters Theses 1911 - February 2014
During the latter half of the 20th century until present day there has been an unprecedented rise in global annual mean temperatures accompanied by rising sea levels and a decrease in Northern Hemisphere snow cover, which if it continues will lead to widespread disruption of climate patterns, ecosystems, and present-day landscapes. It is therefore of critical importance to establish an expanded network of paleoclimate records across the globe in order to better assesses how the global climate system has changed in the past, that we may create a metric by which to address modern change. Herein is presented a7,700 …
A New Species Of Moropus (Mammalia, Perissodactyla, Chalicotheriodea) In The Batesland Formation, Great Plains Area Of North America, Carolyn Rounds
A New Species Of Moropus (Mammalia, Perissodactyla, Chalicotheriodea) In The Batesland Formation, Great Plains Area Of North America, Carolyn Rounds
Masters Theses 1911 - February 2014
The chalicothere Moropus was a rare perissodactyl present in the Great Plains region of North America through much of the Miocene. A temporal gap in named species of Moropus is present in the early Hemingfordian North American Land Mammal Age. This gap is filled by specimens currently referred to as Moropus sp. from the Batesland Formation in southwest South Dakota, and unnamed specimens of Moropus in the Runningwater Formation in northwestern Nebraska. A comparison of the fossils of Moropus nsp. from the Batesland Formation with those of previously described chalicothere species from the Greats Plains region, such as Moropus elatus, …
Exploring Isotopic Signatures Of Lake El'gygytgyn Sediments For Evidence Of Anoxia And Methane Cycling Over The Past 50,000 Years, Addie R. Holland
Exploring Isotopic Signatures Of Lake El'gygytgyn Sediments For Evidence Of Anoxia And Methane Cycling Over The Past 50,000 Years, Addie R. Holland
Masters Theses 1911 - February 2014
Compound specific isotope analysis of lake sediments is a powerful tool in deciphering evidence of changing climatic and paleoenvironmental conditions through time. Isotopic analysis of Lake El’gygytgyn pilot sediment cores, PG1351 and LZ1029, have contributed increased insight into paleoenvironmental interpretations regarding conditions of permanent ice cover and water column anoxia at the lake over the past 250 kyr. Bulk sediment δ15N was measured as a proxy for denitrification and a possible indicator for water column anoxia intensity. However, it appears that insufficient quantities of water column nitrate to fuel denitrification make its correlation with anoxia intensity ineffective. In pilot core …
Three-Dimensionally Preserved Arthropods From The Cambrian (Furongian) Of Quebec And Wisconsin: Systematics, Phylogeny, Ichnology, And Taphonomy, Joseph H. Collette
Three-Dimensionally Preserved Arthropods From The Cambrian (Furongian) Of Quebec And Wisconsin: Systematics, Phylogeny, Ichnology, And Taphonomy, Joseph H. Collette
Masters Theses 1911 - February 2014
Three new types of arthropod from Cambrian intertidal lithofacies of the Elk Mound Group and Lodi Member of Wisconsin, and the Potsdam Group of Quebec are described. These arthropods are preserved ventrally in three dimensions – allowing detailed characterization of morphology. Arenocaris inflata, from the Furongian Elk Mound Group and St. Lawrence Formation, is the earliest occurrence of a phyllocarid. Mosineia macnaughtoni, a large (>10 cm long) euthycarcinoid arthropod, also occurs in Elk Mound strata. Mictomerus melochevillensis represents a new family of early euthycarcinoids, and is a large (8–10+ cm long) arthropod with eleven pairs of homopodous, uniramous limbs. …