1

Open-File Report 1-2018

The University of OklahomaNorman, Oklahoma

2018

Oklahoma Geological SurveyJeremy Boak, Director

Elevation Map of the Top of theCrystalline Basement in Oklahoma

and Surrounding StatesJanuary 2018

Kevin D. Crain and Jefferson C. ChangOklahoma Geological Survey

Open-File Reports are intended to make the results of research that fills a public need available at the earliest possible date. Because of the possibility of that information being superseded by more complete research results, an Open-File Report is intended as a preliminary report not as a final publication. Analyses presented in this article are based on information available to the author(s), and do not necessarily represent the views of the Oklahoma Geological Survey, the University of Oklahoma, their employees, or the State of Oklahoma. The accuracy of the information contained herein is not guaranteed and any mention of trade names is not an endorsement by the author, the Oklahoma Geological Survey, or the University of Oklahoma.

Oklahoma Geological Survey Open-File Report Disclaimer

The Oklahoma Geological Survey is a state agency for research and public service, mandated in the State Constitution to study Oklahoma’s land, water, mineral and energy resources and to provide wise use and sound environmental practices.

OPEN-FILE REPORT 1-2018 ELEVATION MAP OF THE TOP OF THE CRYSTALLINE BASEMENT IN OKLAHOMA AND SURROUNDING STATES

Kevin D. Crain and Jefferson C. Chang INTRODUCTION This Open-File Report (OF) is the first in a series of 16 that shows shaded relief maps of the top and bottom digital elevation model (DEM) grids for stratigraphic units in Oklahoma, Kansas, and parts of Nebraska, Iowa, Missouri, Arkansas, and Texas. Isopach maps from which these DEM grids were derived are also included, along with lithofacies in some instances. Each map covers the area from 41.0 degrees to 34.5 degrees north-south, and -94.0 degrees to -102.0 degrees east-west. The Open-File Reports are published as layered PDFs that contain individual map pages with map layers that can be turned on or off, using Adobe Acrobat1. They are available in PDF and GIS-compatible formats. In each of the 16 Open-File Reports, Plate 1 shows the top elevation of the unit; Plate 2 shows the bottom elevation of the unit; and Plate 3 shows the thickness of the unit. In OF 10-2018 through OF 16-2018, Plate 3 also shows the lithofacies of the unit. The lithofacies maps are taken from Rascoe and Hyne (1988) and use a simple four component carbonate-clastic binary phase diagram with vertical lithology boundaries. The colors represent the relative amount of clastics and carbonates in the rocks. Rocks with a high percentage of clastics are colored yellow, and rocks with a high percentage of carbonates are blue. DESCRIPTION OF 1-2018 shows the shaded relief map of the digital elevation model (DEM) grid of the top of the crystalline basement in Oklahoma and surrounding states. Within the mapped area, the crystalline basement rocks deepen to the south in the Anadarko and Arkoma Basins. METHODS Data used to create the shaded relief maps for the series of 16 Open-File Reports include:

• 16 isopach maps from Petroleum Geology of the Mid-Continent (PGM; Rascoe and Hyne, 1988), which depict the thicknesses of sedimentary strata from the topographic surface to the crystalline basement (Table 1), and

• National Elevation Dataset (NED) surface topography

1 A free version of Adobe Acrobat Reader may be downloaded online at http://acrobat.adobe.com.

Each of the 16 PGM isopach maps were digitally scanned and georeferenced to geographic coordinates at the NAD83 datum and later projected to the Albers Equal-Area Conic projection of the same datum. The contour lines of each isopach map were then digitized and attributed with their corresponding thickness values. In some cases, the PGM isopach maps contain holes where no data are present. These discontinuities occur where (1) a unit pinches out to zero thickness or (2) a fault truncates a unit, resulting in a reduced thickness or disappearance of the unit. In these cases, the isopach used to create the DEMs was modified from the original PGM isopach to show the unit thickness as zero rather than the isopach map containing no data. The digitized isopach thickness data were then gridded and co-registered with the National Elevation Dataset (NED) topography. Starting with the shallowest stratum (Triassic and Cretaceous Systems), the isopach thickness grid was subtracted from the NED topography to get the bottom elevation grid for that stratum; alluvium and terrace deposits were not factored into the model. By definition, the resultant bottom elevation grid is also the top elevation grid of the next lower stratum (Guadalupian Series). This workflow was repeated for each isopach thickness map in sequence until the top of the crystalline basement was reached. For example, the isopach thickness for the Guadalupian Series was subtracted from the top elevation grid of the Guadalupian Series to get the bottom elevation grid for the Guadalupian Series as well as the top elevation grid for the Leonardian Series. The subcrop grid is at a resolution of 30 arc-seconds. INTENTION These elevation models were originally produced to visualize 3D geology and aid in geophysical research. The tops and bottoms of each unit constrain the upper and lower bounds, respectively, of the density distribution within the sedimentary strata of a regional gravity model. The data presented here may also be useful for other subsurface investigations, such as geoengineering, petrophysical, or hydrogeologic applications. The data should be considered preliminary and may contain relative or absolute depth errors in stratigraphic unit elevations. The data may be revised in future iterations, when more subsurface information is made available to the authors. ACKNOWLEDGEMENTS We would like to thank Julie Chang and Jake Walter for their editorial assistance; Jim Anderson and Russell Standridge for their work preparing the PDF publication; and Randy Keller and RPSEA (Research Partnership to Secure Energy for America) for funding this endeavor. REFERENCES Rascoe, B., Jr., and Hyne, N.J., eds., 1988, Petroleum Geology of the Mid-Continent: Tulsa Geological Society Special Publication No. 3, 162 p.

Table 1. Open-File Report number (OF No.) and corresponding PGM isopach maps for units listed stratigraphically from oldest to youngest.

OF No. Unit Series Age PGM Plate No. Page OF 1-2018* Precambrian Basement Precambrian 2 5 OF 2-2018 Arbuckle Group Ordovician 8 35 OF 3-2018 Simpson Group Ordovician 9 39 OF 4-2018 Viola Limestone Ordovician 10 47 OF 5-2018 Sylvan Shale Ordovician 11 49 OF 6-2018 Hunton Group Silurian 12 53 OF 7-2018 Woodford Shale Devonian 14 67 OF 8-2018 Pre-Chesterian Mississippian Rocks Mississippian 15 74 OF 9-2018 Chesterian Series Mississippian 16 80 OF 10-2018 Morrowan Series Pennsylvanian 18 94 OF 11-2018 Atokan and Desmoinesian Series Pennsylvanian 19 107 OF 12-2018 Missourian and Virgilian Series Pennsylvanian 20 113 OF 13-2018 Wolfcampian Series Permian 21 119 OF 14-2018 Leonardian Series Permian 22 128 OF 15-2018 Guadalupian Series Permian 23 129 OF 16-2018 Triassic and Cretaceous Systems Triassic and

Cretaceous 24 130

* This publication

-34000-34000-34000

-34000-34000-34000

-32000-32000-32000

-30000-30000-30000

-20000-20000-20000 -18000-18000-18000

-16000-16000-16000

-16000-16000-16000

-14000-14000-14000

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-100

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Washita

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Russell

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Kearny

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Vernon

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Roberts

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Hayes

Greer

Graham

Adair

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Wheeler

Dawson

Osage

Payne

Sherman

Tulsa

Marshall

Potter

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Hughes

Sedgwick

Hemphill

Benton

Osborne

Scott

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Hamilton

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Roger Mills

Ochiltree

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Page

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AllenStafford

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Sheridan

Moore

Greenwood

Rogers

Miami

Kingman

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Beckham

Lipscomb

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Mitchell

Canadian

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Pawnee

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Lancaster

Hodgeman

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Washington

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Hitchcock

Pawnee

Gentry

Platte

Comanche

Franklin

Fillmore

Franklin

Washington

McClain

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Sequoyah

Edwards

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Oklahoma

Jackson

Webster

Okmulgee

Seminole

Briscoe

Ottawa

Collingsworth

Nuckolls

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Wabaunsee

Wagoner

Okfuskee

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Crawford

Crawford

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Red Willow

Pottawatomie

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-94°

41°

40°

39°

38°

37°

36°

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34.5°-95°-96°-97°-98°-99°-100°-101°-102° -94°

34.5°

36°

37°

38°

39°

40°

41°

35°

´0 25 50 75 100 Miles

0 30 60 90 120 Kilometers

Albers Equal-Area Conic projection; NAD 83 datumContour: Elevation in feet

OF 1-2018, PLATE 1Elevation of Precambrian Basement

byKevin D. Crain and Jefferson C. Chang

After Petroleum Geology of the Mid-Continent, Plate 02, p. 5

125°

50° 50°125° 65°

65°

25°25°

Index map showing outline of study area