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s

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MOOSE MOUNTAIN SHEAR

ZONE

Ygb

Ygb

Ygb

Ygb

Photograph 1. Rapids of the Big Thompson River downstream of Moraine Park.

Photograph 2. Varieties of lupine (family Leguminosae) in rocky 

on glacial till, Moraine Park.

Photograph 7. View westward from near Lyons toward treeless summits of (left to right) Mt. M

Peak (near vertical Diamond face in deep shadow), and Mt. Lady Washington.

Photograph 6. Glacial till of Bull Lake age west of Beaver Meadows entrance to Rocky Mountain National 

Park. Moraine ridge has subdued form, and gneissic boulders are weathered.

Photograph 4. View northward across Lakes Estes at weathered knobs of granite of Longs Peak in the Photograph 5. View westward across glacial outwash deposits and glaciated bedrock knobs of Moraine Park.

Lumpy Ridge area.

Photograph 3. Rounded forms of weathered granite of Longs Peak in the Lumpy 

Ridge area north of Lake Estes.

106°00’ 105°00’

40°30’

40°00’

Mount

Richthofen

Fall River

Pass

Trail Ridge Estes Park

Bowen

Mountain

Grand Lake McHenrys Longs Peak

Peak

Trail

Mountain

Shadow

Mountain

Isolation Allens Park

Peak

Granby Strawberry

Lake

Monarch Ward

Lake

Glen Haven Drake Masonville Loveland

Panorama

Peak

Pinewood

Lake

Carter Lake Berthoud

Reservoir

Raymond Lyons Hygiene Longmont

Gold Hill Boulder Niwot Erie

Izett,

1974

Schroeder,

1995a

Gable and

Madole, 1976

Pearson,

1980

Bucknam and

Braddock, 1989

Braddock,

Calvert, and

others, 1970

Punongbayan

and others, 1989

Braddock,

Houston, and

others, 1988

Madole and

others, 1998

Gable,

1980

Wrucke and

Wilson, 1967

Trimble,

1975

Braddock,

Nutalaya, and

others, 1970

Schroeder,

1995b

Colton,

1978

Colton,

1978

Colton,

1978

Braddock and Cole, 1990

Colton and

Anderson, 1977

Braddock,

Nutalaya, and

others, 1988

Unpublished mapping by Braddock and others, 1970−1985

O'Neill

1981

INDEX TO SOURCES OF GEOLOGIC DATA

R

R

R

R

R R

R

R

R

R

R

R

R

R

R

R

R

Loveland

Longmont

Boulder

Erie

Lyons

Estes

Park

Allens

Park

Ward

Granby

Grand

Lake

**

40°15’

40°00’

0 10 KILOMETERS

40°30’

106°00’ 105°45’ 105°30’ 105°15’ 105°00’

Caribou

stock

AudubonAlbion

stock

Apiatan

Mountain

Porphyry

Peaks

Mt.

Cumulus

stock

Middle Park Basin

Arapahoe Pass

Caribou

antiform

Grassy

Mountain

Burnt Mountain

Tuscarara stock

Bald

Mtn

Sugarloaf

Mtn

Jamestown

stock

Rowena synform

Troublesome Basin

CD

CD

CD

Berthoud

Pass fault

MOOSE MOUNTAIN SHEAR ZONE

Middle Park Basin

Hoosier fault

Maxwell fault

Poorman

fault 

Mt. Richthofen

stock

Sunset stock

INDEX TO GEOLOGIC STRUCTURES

*

Livingston

fault

Denver Basin

Thunderbolt Peak

anticline

LONGS PEAK–ST VRAIN BATHOLITH

BOULDER CREEK BATHOLITH

** * ** *

R

R

Fault—Bar and ball on downthrown block; dashed

where approximately located; R, hanging wall of

steep reverse fault

Thrust fault—Dashed where approximately located

Folds—Showing trace of axial surface and plunge

where known. Laramide (Late Cretaceous to early

Eocene) folds shown in red; Mesoproterozoic (Longs

Peak–St Vrain batholith) folds shown in green; Paleoproterozoic (during metamorphism) folds shown in

magenta; Paleoproterozoic (soft sediment) folds shown

in blue 

Monocline

Overturned syncline—Showing direction of plunge

Sandstone dike in Proterozoic basement rock

Continental Divide

Overturned anticline—Showing direction of plunge

Syncline—Showing direction of plunge

Anticline—Showing direction of plunge

EXPLANATION

Shear zone—Formed during intrusion of granite

 of Longs Peak

Contact—Dashed where approximately located

CD

Laramide intrusive rocks

Troublesome Formation

Middle Park and Coalmont Formations

Paleoproterozoic intrusive rocks

Paleoproterozoic metasedimentary and

 metavolcanic rocks

Mesoproterozoic intrusive rocks

Cretaceous–Pennsylvanian sedimentary rocks

 (dotted line equals Dakota Group in Denver Basin)

Oligocene volcanic rocks

BRADDOCK

PEAK

COMPLEX

Oligocene intrusive rocks

*

XjT

Unconformity

Unconformity

Unconformity

Unconformity

Unconformity

Unconformity

Unconformity

? 

Kl

SEDIMENTARY

ROCKS

INTRUSIVE

ROCKS

VOLCANIC

ROCKS

Kfh

Kp

Kpt

Kpu

Kpr

Kpm

Kph

Kpl

Kn

Kbm

Kd

Jm

Jms

Jmj

Pc Pl

Pl

Po

Pi

Pf

Xbq

METAMORPHIC

ROCKS

LARAMIDE UNITS

Xbf Xbh

YXp

YXp

YgH

YgLP YgLPx YgLPs

Yga Ya

Yd

Yqd

XgdB Xgd Xg

Dk



Ygb

Xbp

Xf

Xfcq

Xb

Xbk

Xh

Xfb

Nt

s

c

Km ql

sy

Ni

Ni

gc rp

gdr ti qla qlx

r

v

ba

rw

vx

ap

Kmw

Kmzd

Klp Kqm Ksyd

Miocene

Upper Oligocene

Eocene

Paleocene

Upper Cretaceous

Lower Cretaceous

Upper Permian

Lower Permian

Mesoproterozoic

Paleoproterozoic

CRETACEOUS

JURASSIC

TRIASSIC

PERMIAN

PENNSYLVANIAN

DEVONIAN

PROTEROZOIC

PALEOGENE

Strike and dip of foliation

Fault breccia zone

Inclined foliation in metamorphic rock

Inclined foliation in mylonite—Showing bearing and plunge

 of lineation in mylonite

Vertical or near-vertical foliation in metamorphic rock

Inclined flow foliation in igneous rock

Vertical or near-vertical foliation in igneous rock

Inclined compaction foliation in welded tuff

10 

20 

10 

–A Disappearance of andalusite

A Appearance of andalusite

G Appearance of garnet

K Appearance of K feldspar—Disappearance of muscovite

M Appearance of partial-melt textures

S Appearance of sillimanite—Disappearance of staurolite

St Appearance of staurolite

Sandstone dike in Proterozoic basement rocks

Contact—Dotted where concealed 

Fault, high-angle—Dotted where concealed

Thrust fault—Dotted where concealed 

Anticline/antiform—Dotted where concealed

Overturned anticline/antiform—Dotted where concealed

Syncline/synform—Dotted where concealed

Monocline—Dotted where concealed

Vertical fold—Dotted where concealed

Overturned syncline/synform—Dotted where concealed

Strike and dip of bedding (in bedrock units)

Inclined

Vertical

Overturned

Inclined—Top direction of beds known from local features

73

Overturned—Top direction of beds known from local features 73

51

51

Boundary of permanent snowfield (s) or lake shoreline

MAP EXPLANATION

Mylonite-bearing shear zone

Area intruded by many small YgLP bodies

Area intruded by many small YXp bodies

Area intruded by many small XjT bodies

75

40

Increasing metamorphic grade

Rock glacier deposit (Holocene and upper Pleistocene)

Organic-rich sediment (Holocene and upper Pleistocene)

Till of Pinedale age (upper Pleistocene)

Till of Bull Lake age (upper and middle Pleistocene)

Till of pre-Bull Lake age (middle and lower? Pleistocene)

Manmade fill (Holocene)

Colluvium (Holocene and upper Pleistocene)

Alluvium and colluvium (Holocene and upper Pleistocene)

Loess (Holocene and upper? Pleistocene)

Landslide deposits (Holocene and upper Pleistocene)

Talus deposits (Holocene and upper Pleistocene)

Troublesome Formation (lower Miocene and upper Oligocene)

Sedimentary rocks, undivided (Oligocene and Eocene?)

Intrusive rocks, undivided (Miocene to Oligocene)

Granite and rhyolite porphyry (late Oligocene)

Rhyolite porphyry (late Oligocene)

Basalt intrusion (late Oligocene)

Grandiorite and monzonite of Mount Richthofen stock (late Oligocene)

Intrusive tuff-breccia (late? Oligocene)

Quartz latite of Apiatan Mountain (late Oligocene)

Quartz latite breccia (upper Oligocene)

POST-LARAMIDE VOLCANIC ROCKS

MESOPROTEROZOIC INTRUSIVE ROCKS

LARAMIDE INTRUSIVE ROCKS

PALEOPROTEROZOIC INTRUSIVE ROCKS

PALEOPROTEROZOIC METAMORPHIC ROCKS

PALEOZOIC(?) INTRUSIVE ROCKS

LARAMIDE SEDIMENTARY AND VOLCANIC ROCKS

MESOPROTEROZOIC AND (OR) PALEOPROTEROZOIC

INTRUSIVE ROCKS

PRE-CENOZOIC SEDIMENTARY ROCKS

GLACIAL UNITS

OTHER SURFICIAL UNITS

POST-LARAMIDE SEDIMENTARY ROCKS

POST-LARAMIDE INTRUSIVE ROCKS

Rhyolite (upper Oligocene)

Rhyolite welded tuff (upper Oligocene)

Volcanic rocks, undivided (upper Oligocene)

Volcanic breccia (upper Oligocene)

Basalt and trachyandesite (upper Oligocene)

Andesite prophyry (upper? Oligocene)

Coalmont Formation (Eocene and Paleocene)

Middle Park Formation (Paleocene and Upper Cretaceous?)

Upper part (Paleocene and Upper Cretaceous?)

Windy Gap Volcanic Member (Upper Cretaceous?)

Syenite and quartz syenite (Paleocene and Eocene)

Quartz latite and rhyodacite porphyry (Paleocene)

Augite latite porphyry (Late Cretaceous)

Quartz monzonite (Late Cretaceous)

Syenodiorite (Late Cretaceous)

Monzodiorite (Late Cretaceous)

Monzogabbro (Late Cretaceous)

Laramie Formation (Upper Cretaceous)

Fox Hills Sandstone (Upper Cretaceous)

Upper part (Lower Triassic and Upper Permian)

Forelle Limestone Member (Upper Permian)

Lower part (Upper Permian)

Lyons Sandstone (Lower Permian)

Ingleside Formation (Lower Permian)

Sedimentary and metamorphic rocks (Mesozoic and Paleo

Kimberlite (Devonian?)

Fountain Formation (Lower Permian and Upper and Midd

Owl Canyon Formation (Lower Permian)

Morrison Formation (Upper Jurassic)

Chugwater Formation (Lower Triassic and Upper Permian

Lykins Formation (Lower Triassic and Upper Permian)

Morrison Formation (Upper Jurassic) and Sundance Form

 Jurassic), undivided

Morrison Formation (Upper Jurassic), Sundance Formatio

 Jurassic), and Jelm Formation (Upper Triassic), undivid

Gabbro of the Iron Dike

Biotite-muscovite alkali-feldspar granite

Aplite

Granite of Longs Peak batholith

Intrusion breccia

Garnet-sillimanite granite

Mafic dikes and plugs

Granite of Hagues Peak

Quartz diorite

Pegmatite

Boulder Creek Granodiorite

Biotite monzogranite

Trondhjemite of Thompson Canyon

Biotite schist and gneiss

Quartzofeldspathic mica schist

Knotted mica schist

Porphyroblastic biotite schist

Biotite gneiss and granitic gneiss, interlayered

Biotite gneiss and hornblende gneiss, interlayered

Hornblende gneiss and amphibolite

Granitic gneiss

Biotite granofels

Granitic gneiss, calc-silicate gneiss, and quartzite, interlay

Granodiorite

Qr

Qo

Qtp

Qtb

Qtpb

f

Qc

Qac

Qlo

Qls

Qta

Nt

s

Ni

gc

rp

bi

bi

gdr

ti

qla

qlx

Kmw

Klp

Kqm

Ksyd

Kmzd

Kmzb

Kmzb

Kl

Kfh

Jm

Jms

Jmj

Pc

Pl

Pf



Pl

Po

Pi

Dk

v

vx

ba

ap

c

Km

sy

ql

YgH

XgdB

Xgd

Xg

XjT

Xb

Xbq

Xbk

Xbp

Xbf

Xbh

Xh

Xf

Xfb

Xfcq

Yga

Ya

YgLP

YgLPx

YgLPs

Yd

Yqd

YXp

r

rw

Ygb

Middle shale member

Plainview Sandstone Member

Lytle Formation

Geology compiled chiefly by W.A. Braddock from 

1985–1995. Geology revised and updated by J.C. Cole 

from 2005–2008

Digital map database prepared by Theodore R. Brandt

Photographs by Frederick C. Brunstein

Editing and digital cartography by 

Gayle M. Dumonceaux,

Denver Publishing Service Center

Manuscript approved for publication July 11, 2008

Base from U.S. Geological Survey, 1984

Projection and 10,000-meter grid, zone 13 

Universal Transverse Mercator

25,000-foot grid ticks based on Colorado

coordinate system, north zone

1927 North American Datum

13°

APPROXIMATE MEAN

DECLINATION, 1984 TRUE NORTH

MAGNETIC NORTH

GEOLOGIC MAP OF THE ESTES PARK 30' x 60' QUADRANGLE, NORTH-CENTRAL COLORADO

By

James C. Cole and William A. Braddock

2009

CONTOUR INTERVAL 50 METERS

NATIONAL GEODETIC VERTICAL DATUM OF 1929

1 0 1 2 43 5 6 7 8 9 10 KILOMETERS

SCALE 1:100 000

1 0 1 2 3 4 5 6 7 8 MILES

COLORADO

QUADRANGLE LOCATION

Printed on recycled paper

Any use of trade names is for descript

and does not imply endorsement by t

For sale by U.S. Geological Survey Inf

Box 25286, Federal Center, Denver, CO 

1-888-ASK-USGS

ArcInfo coverages and a PDF for this m

http://pubs.usgs.gov

Suggested citation:

Cole, J.C., and Braddock, W.A., 2009, G

Estes Park 30’ x 60’ quadrangle, north-

U.S. Geological Survey Scientific Inve

1 sheet, scale 1:100,000, pamphlet, 56