Qd
Glacial drift (Holocene and Pleistocene)
ccg
Granite of Cross Creek (Precambrian)
mt
Migmatite (Precambrian)
Qag
Alluvium and gravels (Holocene and Pleistocene)
Qdpb
Glacial drift (Pleistocene)
cg
Precambrian shear zone
bg
Biotite gneiss and schist (Precambrian)
mdg
Mixed migmatite, diorite, and granitic rocks (Precambrian)
di
Biotite-quartz diorite (Precambrian)
Cs
_s
Sawatch Quartzite (Upper Cambrian)
Cp
_p
Peerless Formation (Upper Cambrian)
ug
Unclassified granites (Precambrian)
Qlt
Landslide debris and talus (Holocene and Pleistocene)
Pm
*m
Minturn Formation (Middle Pennsylvanian)
Pmw (Pm)
*mw (*m)
Minturn Formation, Wearyman Dolomite Member (Middle Pennsylvanian)
w
Open water
Pmh (Pm)
*mh (*m)
Minturn Formation, Hornsilver Dolomite Member (Middle Pennsylvanian)
d (Pm)
Minturn Formation, dolomite bed or reef (Middle Pennsylvanian)
QTc
Preglacial colluvium (Pleistocene or Pliocene)
Pmrl
*mrl
Minturn Formation, Robinson Limestone Member (Middle Pennsylvanian)
Kp
Pando Porphyry (Upper Cretaceous)
Ml
Leadville Dolomite (Lower Mississippian)
Dc
Chaffee Formation (Upper Devonian)
Pmrl(Pmrl)
*mrl(*mrl)
h
Hornblendite (Precambrian)
p
Pegmatite (Precambrian)
Pb
*b
Belden Formation (Middle Pennsylvanian)
hc
Hornblende and calc-silicate gneisses (Precambrian)
d (Pmrl)
Minturn Formation, Robinson Limestone Member, dolomite bed or reef (Middle Pennsylvanian)
TKe
Elk Mountain Porphyry (Paleocene or Upper Cretaceous)
Pmr (Pm)
*mr (*m)
Minturn Formation, Resolution Dolomite Member (Middle Pennsylvanian)
Qdr
Recent moraines (Holocene)
dd
Diorite dikes (Precambrian)
Ql
Loess (Pleistocene)
Tl
Lincoln Porphyry (Paleocene)
gdd
Granitic and dioritic rocks of Holy Cross City, predominantly dioritic facies - Most abundant (Precambrian)
Pm?
*m?
Minturn Formation, uncertain (Middle Pennsylvanian)
hd
Hornblende diorite (Precambrian)
gd
Granitic and dioritic rocks of Holy Cross City, predominantly granodioritic facies (Precambrian)
gdg
Granitic and dioritic rocks of Holy Cross City, predominantly granitic facies - Least abundant (Precambrian)
Dcp
Chaffee Formation, Parting Quartzite Member (Upper Devonian)
Dcd
Chaffee Formation, Dyer Dolomite Member (Upper Devonian)
Trp
Rhyolite porphyry (Oligocene)
Ter
Eagle River Porphyry (Paleocene?)
Ou
Harding Sandstone and Manitou Dolomite undivided (Middle and Lower Ordovician)
Kg
Granodiorite (Upper Cretaceous)
hc (Su)
bg (Su)
su
St. Kevin Granite undivided (Precambrian)
sn
St. Kevin Granite, normal facies (Precambrian)
Om
Manitou Dolomite (Lower Ordovician)
hc (Shear)
Tl (a)
TKs
Sacramento Porphyry (Paleocene or Upper Cretaceous)
sn (Su)
sn (Shear)
Tir
Intrusive rhyolite (Pliocene or Miocene)
sh
St. Kevin Granite, trachytoid hybrid facies (Precambrian)
TKsd
Syenite and diorite (Paleocene or Upper Cretaceous)
ml
Metalamprophyre (Precambrian)
TKu
Unclassified porphyries (Tertiary and Upper Cretaceous)
sf
St. Kevin Granite, fine-grained facies (Precambrian)
sf (Shear)
Qm
Malta Gravel (Pleistocene)
Tlb
Latite breccia (Oligocene)
Thl
Hornblende latite porphyry (Paleocene?)
sf (a)
su (a)
sn (a)
TKj
Johnson Gulch Porphyry (Paleocene or Upper Cretaceous)
sg
St. Kevin Granite, granodiorite facies (Precambrian)
TKu (a)
pCr
p_r
Precambrian rocks of unknown character
Pb?
*b?
Belden Formation, uncertain (Middle Pennsylvanian)