1

Open-File Report 6-2018

The University of OklahomaNorman, Oklahoma

2019

Elevation and ickness of theSilurian Hunton Group in

Oklahoma and Surrounding StatesApril 2019

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 Because of the possibility of that information being superseded by more complete research results, an Open-File Report is intended as a preliminary report not as a final publication.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 6-2018 ELEVATION AND THICKNESS OF THE SILURIAN HUNTON GROUP IN OKLAHOMA AND SURROUNDING STATES

Kevin D. Crain and Jefferson C. Chang INTRODUCTION This Open-File Report (OF) is the sixth 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. They are available in PDF and GIS 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 9-2018 through OF 15-2018, 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 6-2018 shows the shaded relief map of the top (Plate 1) and bottom (Plate 2) digital elevation model (DEM) grids of the Silurian Hunton Group, as well as the unit’s thickness (Plate 3), in Oklahoma and surrounding states. METHODS Data used to create the shaded relief maps for the series of 16 Open-File Reports include:

• sixteen 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 Each of the sixteen PGM isopach maps were digitally scanned and georeferenced to geographic coordinates using the datum North American 1983 and later projected to the Albers Equal Area Conic projection of the same datum.

In some cases, the PGM isopach maps contain holes where no data is 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 the shallowest stratum (Triassic and Cretaceous Systems); 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. Due to the map scale, there are no elevation contours for the outcrop topography. The subcrop grid is at a scale of 30 arcseconds. 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. 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. ACKNOWLEDGEMENTS We would like to thank Julie Chang and Jake Walter for their editorial assistance; David Morris and Russell Standridge for their work preparing the PDF publication; and Randy Keller and RPSEA for funding this endeavor.

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

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Top Elevation of Hunton Groupby

Kevin D. Crain and Jefferson C. Chang

Miles0 25 50 75 100

Kilometers0 30 60 90 120

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

OF 6-2018, PLATE 1REFERENCES

Rascoe, B. Jr., and Hyne, N. J., eds., 1988, Petroleum Geology of the Mid-Continent: Tulsa Geological Society Special Publication No. 3, 162 p.Plate 12, p. 53

OsageTexas

Ellis

Beaver

Butler

Kay

Ford

Reno

Ellis

Ness

Elk

Gove

Le Flore

Caddo

Finney

Gray

Clark

Woods

Grady

Grant

Lyon

Gray

Logan

Major

Kiowa

Barber

Creek

Rice

Gage

Lincoln

Smith

Trego

Pittsburg

Pratt

Cowley

Harper

Custer

Sumner

Blaine

Bates

Jewell

Dewey

Clay

Lane

Meade

Linn

Alfalfa

Scott

Craig

Rooks

MarionRush

Cass

Rawlins

Lincoln

Barton

Garfield

Donley

Thomas

Hall

Dundy

Norton

Chase

Carson

ClayOtoe

Frontier

Noble

Riley

Washita

Phillips

HallBuffalo

Garvin

Russell

Cloud

Kearny

Chase

Logan

Kiowa

Vernon

Harper

Roberts

Holt

Woodward

Saline

Decatur

York

Morris

Hayes

Greer

Graham

Adair

Perkins

Wheeler

Dawson

Osage

Payne

Sherman

Tulsa

Marshall

Potter

Wallace

Hughes

Sedgwick

Hemphill

Benton

Osborne

Scott

Mayes

Hamilton

Furnas

Grant

Roger Mills

Ochiltree

Coffey

Page

Hansford

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Sheridan

Moore

Greenwood

Rogers

Miami

Kingman

Wichita

Latimer

Beckham

Lipscomb

Cass

Morton Jasper

Mitchell

Canadian

Nodaway

Pawnee

Saline

Cheyenne

Clay

Kingfisher

Comanche

Stevens

Brown

Taylor

Barton

Greeley

Armstrong

Coal

Labette

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Harlan

Wilson

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Polk

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Randall

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Washington

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Ray

Oklahoma

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40°

39°

38°

37°

36°

35°

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

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Midc

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Bottom Elevation of Hunton Groupby

Kevin D. Crain and Jefferson C. Chang

Miles0 25 50 75 100

Kilometers0 30 60 90 120

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

OF 6-2018, PLATE 2REFERENCES

Rascoe, B. Jr., and Hyne, N. J., eds., 1988, Petroleum Geology of the Mid-Continent: Tulsa Geological Society Special Publication No. 3, 162 p.Plate 12, p. 53

OsageTexas

Ellis

Beaver

Butler

Kay

Ford

Reno

Ellis

Ness

Elk

Gove

Le Flore

Caddo

Finney

Gray

Clark

Woods

Grady

Grant

Lyon

Gray

Logan

Major

Kiowa

Barber

Creek

Rice

Gage

Lincoln

Smith

Trego

Pittsburg

Pratt

Cowley

Harper

Custer

Sumner

Blaine

Bates

Jewell

Dewey

Clay

Lane

Meade

Linn

Alfalfa

Scott

Craig

Rooks

MarionRush

Cass

Rawlins

Lincoln

Barton

Garfield

Donley

Thomas

Hall

Dundy

Norton

Chase

Carson

ClayOtoe

Frontier

Noble

Riley

Washita

Phillips

HallBuffalo

Garvin

Russell

Cloud

Kearny

Chase

Logan

Kiowa

Vernon

Harper

Roberts

Holt

Woodward

Saline

Decatur

York

Morris

Hayes

Greer

Graham

Adair

Perkins

Wheeler

Dawson

Osage

Payne

Sherman

Tulsa

Marshall

Potter

Wallace

Hughes

Sedgwick

Hemphill

Benton

Osborne

Scott

Mayes

Hamilton

Furnas

Grant

Roger Mills

Ochiltree

Coffey

Page

Hansford

AllenStafford

LincolnOttawa

Sheridan

Moore

Greenwood

Rogers

Miami

Kingman

Wichita

Latimer

Beckham

Lipscomb

Cass

Morton Jasper

Mitchell

Canadian

Nodaway

Pawnee

Saline

Cheyenne

Clay

Kingfisher

Comanche

Stevens

Brown

Taylor

Barton

Greeley

Armstrong

Coal

Labette

Dickinson

Harlan

Wilson

Nemaha

Haskell

Polk

Seward

Delaw

are

Randall

Newton

Republic

Thayer

Pontotoc

Stanton

Muskogee

Adams

HutchinsonCherokee

Jackson

Ellsworth

McPherson

Phelps

Haskell

Lancaster

Hodgeman

McIntosh

Nowata

Washington

HarveyBourbon

Neosho

Jackson

Hitchcock

Pawnee

Gentry

Platte

Comanche

Franklin

Fillmore

Franklin

Washington

McClain

Sherman

Sequoyah

Edwards

Ray

Oklahoma

Jackson

Webster

Okmulgee

Seminole

Briscoe

Ottawa

Collingsworth

Nuckolls

Harmon

Wabaunsee

Wagoner

Okfuskee

Seward

Geary

Crawford

Crawford

Atchison

Swisher

Red Willow

Pottawatomie

Gosper

Jefferson

Fremont

Kearney

Ringgold

Anderson

Cherokee

Jefferson

Clinton

ShawneeDouglas

Andrew

Johnson

Cleveland

Seba

stian

Woodson

McDonald

PawneeDe Kalb

Chautauqua

Hamilton

Atchison

Richardson

NemahaWorth

Johnson

StephensChildress

DoniphanBuchanan

Atoka Pushmataha

Mills Union

Murray

Adams

Tillman

Potta

watom

ieMontgomery

Harri

son

Leav

enwo

rth

Washi

ngton

Davie

ssCa

ldwell

Barry

Johnso

nDa

deHe

nry

Wyan-

Frank

linCe

dar

Montgomery

Lafay

ette

Lawr

ence

Saint

Clair

Loga

n

dotte

-102° -101° -100° -99° -98° -97° -96° -95° -94°41°

40°

39°

38°

37°

36°

35°

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

36°

37°

38°

39°

40°

41°

35°

K A N S A S

O K L A H O M A

N E B R A S K A

MIS

SO

UR

I

I O W A

AR

KA

NS

AS

T E X A S

AnadarkoBasin

Amarillo Uplift ArbuckleMtn. Uplift Seminole

ArchArkoma Basin

Nema

ha U

plift

Salina Basin

Forest CityBasin

Southern OklahomaAulacogen

Midc

ontin

ent R

ift

0

100

250

500750

10001250

0

250

500

0

500

0

0

0

0

500

500

100250

0

0

100

100100

250500

0

0

250

0

100

0

0250

500

Thickness of Hunton Groupby

Kevin D. Crain and Jefferson C. Chang

Miles0 25 50 75 100

Kilometers0 30 60 90 120

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

OF 6-2018, PLATE 3REFERENCES

Rascoe, B. Jr., and Hyne, N. J., eds., 1988, Petroleum Geology of the Mid-Continent: Tulsa Geological Society Special Publication No. 3, 162 p.Plate 12, p. 53