Portland.metadata.txt

Data set name:	USGS #1 Portland
Location:	Sect. 2, T19S, R68W, Fremont Co., Colorado
Contributor:	Walter E. Dean
Funding source:	U. S. Geological Survey; Department of Energy


References:

Burns, C. E., and Bralower, T. J., 1998, Timing of mid-Cretaceous relative
sea level changes in the western Interior Seaway:  Implications for the
origins of lithologic cycles in the Greenhorn and Niobrara Formations, In
Dean, W. E., and Arthur, M. A., eds., Stratigraphy and Paleoenvironments of
the Cretaceous Western Interior Seaway, USA:  Society of Economic
Paleontologists and Mineralogists (SEPM), Concepts in Sedimentology and
Paleontology, No. 6.

Sageman, B. B. Rich J., Arthur, M. A., Dean, W. E., Savrda, C. E., and
Bralower, T. J., 1998, Multiple Milankovitch cycles in the Bridge Creek
Limestone (Cenomanian-Turonian, Western Interior basin, In Dean, W. E., and
Arthur, M. A., eds., Stratigraphy and Paleoenvironments of the Cretaceous
Western Interior Seaway, USA:  Society of Economic Paleontologists and
Mineralogists (SEPM), Concepts in Sedimentology and Paleontology, No. 6.

Savrda, C. E., 1998, Ichnology of the Bridge Creek Limestone:  Evidence for
temporal and spatial variations in the Western Interior Seaway, In Dean, W.
E., and Arthur, M. A., eds., Stratigraphy and Paleoenvironments of the
Cretaceous Western Interior Seaway, USA:  Society of Economic
Paleontologists and Mineralogists (SEPM), Concepts in Sedimentology and
Paleontology, No. 6.

Savrda, C. E., 1998, Ichnocoenoses of the Niobrara Formation:  Implications
for benthic oxygenation histories, In Dean, W. E., and Arthur, M. A., eds.,
Stratigraphy and Paleoenvironments of the Cretaceous Western Interior
Seaway, USA:  Society of Economic Paleontologists and Mineralogists (SEPM),
Concepts in Sedimentology and Paleontology, No. 6.

"Portland.Carlile.carbons.txt" file
	Contains results of total-, carbonate-, and organic-carbon analyses
of samples from the Carlile Shale in the Portland core.
Variable Names:
	Depth-ft	depth in core in feet
	Depth-m	depth in core in meters
	% T-C	percent total carbon
	% IC		percent inorganic carbon
	% TOC	% total organic carbon
	% CaCO3	% calcium carbonate calculated from % C-C

"Portland.carbon&isotope.txt" file
	Contains results of whole-rock total-, carbonate-, and
organic-carbon analyses, and carbon and oxygen isotope analyses of samples
from the Bridge Creek Limestone Member of the Greenhorn Formation in the
Portland core.
Variable Names:
	Depth (ft)	depth in core in feet
	Depth (m)	depth in core in meters
	% TC		percent total carbon
	% IC		percent carbonate carbon
	% CaCO3	% calcium carbonate calculated from % IC
	% TOC	% total organic carbon
	13C-wr	carbon isotopic composition of whole-rock (wr) carbonate
expressed in the usual per mil delta notation relative to the University of
Chicago Pee Dee belemnite (PDB) marine carbonate standard.
	18O-wr	oxygen isotopic composition of whole-rock (wr) carbonate
expressed in the usual per mil delta notation relative to the University of
Chicago Pee Dee belemnite (PDB) marine carbonate standard.

"Portland.nannos.Niob.txt" file
	Contains calcareous nannofossil abundance data (as percentages of
total nannofossils) for samples from the transition between the  Fort Hays
and Smoky Hill Members of the Niobrara Formation in the Portland core.
Variable Names:
	Depth (ft)	depth in core in feet
	Depth (m)	depth in core in meters
	Species Richness	 The species richness of a sample as a
measure of diversity was determined by counting the total number of
different species that are identified in each sample.
	W. barnesae	percent of the species Watznmaueria barnesae in a
sample
	B. constans	percent of the species Biscutum constans in a sample
	Zygodiscus spp.	percent of all species of Zygodiscus in a sample
	Eiffellithus spp.	percent of all species of Effelithus in a
sample
	Cretarhabdus spp.	percent of all species of Cretarhabdus  in
a sample
	Prediscosphaera spp.	percent of all species of Prediscosphaera
in a sample
	Tranolithus spp.	percent of all species of Tranolithus in a sample

"Portland.nannos.Br.Ck.txt" file
	Contains calcareous nannofossil abundance data (as percentages of
total nannofossils) for samples from the Bridge Creek Limestone Member of
the Greenhorn Formation in the Portland core.
Variable Names:
	Depth (ft)	depth in core in feet
	Depth (m)	depth in core in meters
	Species Richness	 The species richness of a sample as a
measure of diversity was determined by counting the total number of
different species that are identified in each sample.
	CaCO3	percent calcium carbonate
	W. barnesae	percent of the species Watznmaueria barnesae in a
sample
	B. constans	percent of the species Biscutum constans in a sample
	Zygodiscus spp.	percent of all species of Zygodiscus in a sample
	Eiffellithus spp.	percent of all species of Effelithus in a
sample
	Cretarhabdus spp.	percent of all species of Cretarhabdus  in
a sample
	Prediscosphaera spp.	percent of all species of Prediscosphaera
in a sample
	Tranolithus spp.	percent of all species of Tranolithus in a
sample

"Portland.Logs.txt" file
	Contains data from geophysical logs of the Portland well.
Variable Names:
	Depth (ft)	depth in core in feet
	Depth (m)	depth in core in meters
	Gamma (API) gamma radiation in API (American Petroleum Institute) units
	Neutron Porosity (%)	neutron porosity of rock in percent
	Sonic (m/sec)	velocity of sound through rock in meters per second
	Gamma (API)	gamma radiation in API (American Petroleum Institute)