This DGGS Raw Data File presents 40Ar/39Ar age dating results for selected igneous rocks encountered in the Styx River area of the western Alaska Range. Crystallization ages on biotite and hornblende from plutonic rocks range from about ~60 to ~63 Ma, while a sericite alteration age in plutonic rocks altered by a dike swarm also is around ~63 Ma. Sericite alteration associated with a copper-molybdenum porphyry ranges from ~10 to ~11 Ma. Analyses were performed by the University of Alaska Fairbanks Geochronology Laboratory, and results were reported by Paul Layer and Jeff Benowitz. This data release includes the following products: a summary of sample collection methods, the laboratory report, analytical data tables and associated metadata, and plots of the 40Ar/39Ar age spectra, Ca/K, and Cl/K ratios. All components of this data release are downloadable from the DGGS website at no charge.

The dataset includes subsurface stratigraphic picks for the top of the Foremost Formation (Belly River Group) in the Alberta Plains (Townships 1 to 52, Ranges 1W4 to 5W5) made from downhole wireline geophysical well logs. The top of the Foremost was picked at the base of a continuous sandstone or siltstone bed (low-gamma-ray) of variable thickness overlying the Taber coal zone. Well data were screened to detect errors resulting from deviated wells, as well as incorrect ground and kelly bushing elevation data. We used statistical methods to identify local and regional statistical outliers, which were examined individually.

This set of data files contains analyses of samples representing Triassic units (Shublik and Ivishak Formations and Karen Creek Sandstone) in Alaska. The samples were collected from 20 outcrop localities in northeastern Alaska. The data set includes total organic carbon (TOC) and geochemical data from inductively coupled plasma-optical emission spectroscopy-mass spectroscopy (ICP-OES-MS) and portable X-ray fluorescence (p-XRF). The data presented here are described and interpreted in a paper titled "Facies Variation within Outcrops of the Triassic Shublik Formation, Northeastern Alaska".

This set of data files contains analyses of samples representing Triassic units (Shublik and Ivishak Formations and Karen Creek Sandstone) in Alaska. The samples were collected from 20 outcrop localities in northeastern Alaska. The data set includes total organic carbon (TOC) and geochemical data from inductively coupled plasma-optical emission spectroscopy-mass spectroscopy (ICP-OES-MS) and portable X-ray fluorescence (p-XRF). The data presented here are described and interpreted in a paper titled "Facies Variation within Outcrops of the Triassic Shublik Formation, Northeastern Alaska".

A digital grid of the top of the Empress Fm. Unit 2 silt and clay, (the middle unit in the Empress Formation), where present, or the topography of the surrounding landscape, where Unit 2 is absent. The unit is originally modeled from borehole data and adjusted to the bedrock surface, the surface of Unit 1, and the present-day land surface. The grid is generated at a 250 m cell-size resolution, based on information as recent as 2003.

A digital grid of the top of the Empress Formation where present, or the topography of the surrounding landscape, where the formation is absent. This includes the units 1 to 3 of the Empress Formation in buried valleys, as well as undifferentiated Empress interfluve sediments resting on the bedrock surface between buried valleys. The unit is originally modelled from borehole data and adjusted to the bedrock surface, the surfaces of units 1, 2, 3 and interfluve units of the Empress Formation, and the present-day land surface. The grid is generated at a 250 metre cell-size resolution, based on 2003 information.

This digital dataset is a result from the goal within the U.S. Geological Survey’s (USGS) National Cooperative Geologic Mapping Program to convert surficial data that were previously published in non-digital format to digital, vector-based data suitable for use by the public and in USGS studies. The objective of the data conversion is to reproduce the original published mapping with little to no added interpretation. This digital data release captures subsurface geologic data within the Mississippi Embayment region, using two publications focusing on water resources and general geology to fulfill missing pieces of a larger network of data. These two legacy publications, ‘Maps of upper Mississippi embayment Paleozoic and Precambrian rocks’ by Richard L. Dart, 1995 and ‘General Geology of the Mississippi Embayment’ By E. M. Cushing, E. H. Boswell, And R. L. Hosman, 1964- were chosen due the focus on structural and isopach data within their publications. There were six selected map figures with structural data digitized, two from Dart, 1995 and four from Cushing, 1964. This does not include any additional input data or speculative interpretations, strictly published structural contour features. While there were six identified maps, there are only five sets of vector data, this is due to combining both sets of Paleozoic features into one feature class- one can differentiate the two based on the listed source attribute. This geologic data set includes structure contour data for the top of the Eocene Sparta Sand, the base of Eocene Cane River Formation and stratigraphic equivalents, the top of Cretaceous rocks, the top of Paleozoic rocks, and the top of Precambrian basement rock. The Sparta Sand is identified as the middle part of the Eocene and is a formation within the Claiborne Group, the Cane River Formation underlies the Sparta Sand and includes all rock from the top of the Carrizo Sand to the base of the Sparta Sand. The Mississippi embayment is an extensive sediment-filled geologic structure underlying parts of eight states in the southcentral U.S. that provides large quantities of groundwater from numerous aquifers to residential and industrious areas. Due to the large size of the Mississippi Embayment and its cross-cutting political boundaries, the names given to the many geologic units may vary from region to region. It is common to call a unit by the name given by the local area, for example; west Tennessee terms the Memphis aquifer the Sparta Sand and Corrizo Sand aquifers, additionally the Sparta Sand is referred to as the Cane River in Arkansas and Louisiana and is the equivalent to the Mount Selma Formation of Texas and the Tallahatta Formation in Mississippi and Alabama.