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S I L V I E S R I V E R C A L D E R A

PG9PG8

PG7PG6

PG5PG4PG3

PG2

PG1

PG45

PG44PG43

PG42

PG41

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PG39 PG38

PG37PG36PG35

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PG33

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PG31PG30

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PG23PG22

PG21 PG20

PG19PG18

PG17PG16

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8.41 ±0.16 Ma

6.82 ± 0.33 Ma

421

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UPPER CENOZOIC SURFICIAL DEPOSITS

UPPER CENOZOIC VOLCANIC AND SEDIMENTARY ROCKS

Angular unconformity to disconformity

UPPER MIOCENE VOLCANIC AND SEDIMENTARY ROCKS

LOWER PLEISTOCENE TO UPPER MIOCENE SEDIMENTARY ROCKS

EXPLANATION OF MAP UNITSSee Explanation of Map Units in the accompanying pamphlet for complete unit descriptions.

Ar/

Ar/ Ar

,Ar/ Ar

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TIME-ROCK CHART

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ATER

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300

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Location of whole-rock XRF geochemical analysissample; open circle where multiple data points overlap

D1514'

Cross section line

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Contact — Solid line where accurately located, long-dashed where approximate, short-dashed where inferred, dotted where concealed, queried where identity or existence questionable

Caldera margin — Identity and existence certain, location concealed. Ticks pointinto caldera

Fault — Thick solid line where accurately located, long-dashed where approximate, short-dashed where inferred, dotted where concealed, queried where identity orexistence questionable

EXPLANATION OF SYMBOLS

8.41 ± 0.15 Ma Location of radiometric age sample,

age in millions of years (Ma)

Gently inclined (between 0 and 30 ) bedding, asdetermined remotely or from aerial photographs; showing approximate strike and direction of dip

2

A'A

Normal fault (in cross section) — Short-dashed line where inferred, dotted where approximate. Arrows show relative motion

!PG4

!

395

Road

U.S. highway

M Syncline — Thick solid line where accurately located, long-dashed where approximate, short-dashed where inferred, dotted where concealed, queried where identity orexistence questionable

Horizontal bedding, as determined remotely orfrom aerial photographs

119°0'0"W

119°0'0"W120°0'0"W

44°0'0"N 44°0'0"N

43°0'0"N 43°0'0"N

Frenchglen

Burns

Seneca

15

54

8

14

9 10

7

11 12 13

16

17

18

2119 20

23

24 25

2726

22

6

2

1

3

395

78

205

20

395

20

HARNEY COUNTY

MalheurLakeHarney

Lake

USGS geologic mapping completed

DOGAMI geologic mapping completed

FY 2016 - 2019 EdMap project areas (Portland State University, Oregon)

FY 2018 DOGAMI STATEMAP (this study)

1. Big Canyon

4. Landing Creek5. Mosquito Flat6. Devine Ridge North

8. Burns Northwest9. Poison Creek (this study)10. Devine Ridge South11. Harney12. Buchanan

15. Burns (this study)16. Mahon Creek17. Crane18. New Princeton19. Southeast Harney Lake

21. Adobe Flat

24. Irish Lake25. Krumbo Reservoir26. Frenchglen27. Page Springs

U.S. Geological Survey 7.5’ Quadrangles by Number

FY 2019 DOGAMI STATEMAP geologic mapping

Future DOGAMI geologic mapping targets

OREGONBasinMap

Extent

StreamCounty boundaryHarney basin hydrologic boundary

Waterbody

Route State Federal78 395

APPROXIMATE MEANDECLINATION, 2019

14.02

MAG

NET

IC N

ORT

H

TRU

E N

ORT

H

Burns

SouthBurns NW

NorthFlat

Burns

U.S. Geological Survey 7.5-minute quadrangles. Map plate extent shown with a filled brown polygon.

OREGON

1 0 10.5MILE

1 0 10.5KILOMETER

Contour interval is 40 feet.

SCALE 1:24,000(1 inch equals 2000 feet)

GMS-123Geologic Map of the Poison Creek and Burns 7.5' Quadrangles,

Harney County, Oregon

By Jason D. McClaughry, Carlie J.M. Duda, and Mark L. Ferns

PLATE 1

2019

Geologic Map of the Poison Creek 7.5' Quadrangle, Harney County, OregonDEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES

STATE OF OREGON

BRAD AVY, STATE GEOLOGISTwww.oregongeology.org

OR

EG

ON

DE

PA

RTM

E NT O F G E O L O G Y A NDM I NE

RA

LI N

DU

ST

RIE

S

1937

Geologic mapping of the Poison Creek 7.5' quadrangle was supported in part by a grant from the STATEMAP component of the National Cooperative Geologic Mapping Program (G18AC00136).

Additional funds were provided by the State of Oregon.

B

B'

A'

A

119°0'0"W

119°0'0"W

119°7'30"W

119°7'30"W 43°45'0"N43°37'30"N

43°4

5'0"

N43

°37'

30"N

330000E

330000E

335000E

335000E

4835

000N

4835000N

4840

000N

4840000N

4845

000N

4845000N

NOTICE: This manuscript is submi�ed for publica�on with the understanding that the United States Government is authorized to reproduce and distribute reprints for governmental use. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily represen�ng the official policies, either expressed or implied, of the U.S. government.

This product is for informa�onal purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this informa�on should review or consult the primary data and informa�on sources to ascertain the usability of the informa�on. This publica�on cannot subs�tute for site-specific inves�ga�ons by qualified prac��oners. Site-specific data may give results that differ from the results shown in the publica�on.

Source Data: Three-foot bare earth lidar digital elevation model for Poison Creek (43119-F1) quadrangle derived from multiple Oregon Lidar Consortium airborne lidar surveys: Harney 3-DEP 2018 and Burns 2011. These data are distributed through the Oregon Department of Geology and Mineral Industries (DOGAMI) Lidar Program (https://gis.dogami.oregon.gov/maps/lidarviewer/). Water features from USGS High Resolution National Hydrography Dataset (NED): Aquatic Resources Information System (ARMIS) (2017). Road features from Oregon Department of Transportation (ODOT) (2015).

Projection: Oregon Statewide Lambert Conformal Conic, Unit: International Feet,Horizontal Datum: NAD 1983 HARN. UTM Coordinates: Zone 11N, NAD83.

Software: Esri ArcGIS® v10.6 and Adobe® Illustrator® 2019 v23.0.3

Field Work: Field work conducted in 2018 and 2019 by Jason D. McClaughry, DOGAMI; Carlie J.M. Duda, DOGAMI; and Darrick Boschmann, Oregon Water Resource Department

References: Cohen, K. M., Finney, S. C., Gibbard, P.L. and Fan, J.-X, 2013,The ICS International Conostratigraphic Chart: Episodes 36, p. 199-204.

Gradstein, F. M., Ogg, J. G., and Smith, A. G., eds., 2004,A geologic time scale: Cambridge, U.K., Cambridge University Press, 589 p.

Ogg, J. G., Ogg, G., and Gradstein, F. M., 2008, The concise geologic time scale: New York,Cambridge University Press, 184 p.

Geology Reviewers: Martin Streck, Portland State University, Oregon; Josh Hackett, Oregon Water Resource Department; Clark A. Niewendorp, DOGAMI (retired); Ian P. Madin, DOGAMI; and Robert A. Houston, DOGAMI.

Digital Cartography: Jon J. Franczyk, DOGAMI

HARNEY BASIN LOCATION MAP