Filters: Tags: 1700 - Paleontology (X)6 results (43ms)
The drilling project at Owens Lake commenced in April,1991. This Open-File Report represents an effort to makeavailable to other researchers our preliminary datacollected during the first year of study followingcompletion of the core-drilling phase. Nineteen datacollections and preliminary interpretations are presentedin the following sections. They are the work of fifteenfirst-authors and their numerous co-authors. Broadly,their topics include a field log of the core(1 contribution), sedimentological analyses (1), clay-mineral identification (1), geochemical analyses (5),dating and age estimates of the cored sediments (4), andidentifications of fossil materials (7).
The U.S. Geological Survey recovered 9 piston cores from theNorthwind Ridge in the Canada Basin of the Arctic Ocean from acruise of the USCGC Polar Star during 1988. Preliminaryanalysis of the cores suggests sediments deposited onNorthwind Ridge preserve a detailed record of glacial andinterglacial cycles for the last few hundred-thousand to onemillion years. This report includes quantitative data onforaminifers and selected sediment size-fraction data insamples from Northwind Ridge core PI-88AR P5.
Planktic foraminifer census data from Northwind Ridgecores PI-88-AR P3, PI-88-AR P7, and PI-88-AR P9, ArcticOcean
The U.S. Geological Survey recovered 9 piston cores from theNorthwind Ridge in the Canada Basin of the Arctic Ocean from acruise of the USCGC Polar Star during 1988. Preliminaryanalysis of the cores suggests sediments deposited onNorthwind Ridge preserve a detailed record of glacial andinterglacial cycles for the last few hundred-thousand to onemillion years. This report includes quantitative data onforaminifers and selected sediment size-fraction data in 98samples from Northwind Ridge core PI-88AR P3, 51 samples fromcore PI-88-AR P7 and 117 samples from core PI-88-AR P9.
The PRISM 8�x10� data set represents several years ofinvestigation by PRISM (Pliocene Research, Interpretation, andSynoptic Mapping) Project members. One of the goals of PRISMis to produce time-slice reconstructions of intervals ofwarmer than modern climate within the Pliocene Epoch. Thefirst of these was chosen to be at 3.0 Ma (time scale ofBerggren et al., 1985) and is published in Global andPlanetary Change (Dowsett et al., 1994). This documentcontains the actual data sets and a brief explanation of howthey were constructed. For paleoenvironmental interpretationsand discussion of each data set, see Dowsett et al., inpress. The data sets includes sea level, land icedistribution, vegetation or land cover, sea surfacetemperature...
Stratigraphy, Sedimentology, Paleontology, and Paleomagnetism ofPliocene-Early Pleistocene Lacustrine Deposits in Two Cores fromWestern Utah
The data contained in this report represent our preliminary findingsof the analyses of two cores of Pliocene and early Pleistocenesediments from the eastern Great Basin. This is a collaborativeproject involving specialists from the USGS, Kansas State University,and the University of California-Davis in paleontology (Thompson,Buchner, Forester, Bradbury), stratigraphy and sedimentology (Oviatt,Kelsey, Bracht), and paleomagnetism and environmental magnetism(Roberts).
The Arctic Ostracode Database provides species census data for about100 species of benthic marine Ostracoda from modern surface and lateQuaternary sediments from various parts of the Arctic Ocean andadjacent seas. Ostracodes are a microfossil group of bivalvedCrustacea that secrete a calcareous shell commonly preserved insediments in the Arctic region. Because many ostracode species haveecological limits controlled by temperature, salinity, oxygen, foodand other factors, they can provide an important tool forpaleoceanographic reconstruction in the Arctic. Some recentapplications of ostracodes to understanding Arctic Ocean historyinclude Briggs (1983), Reimnitz et al. (1983, 1992), McDougall etal. (1986), Clark et...