NAME OF DATA SET:  GEOLOGY   

DATA TYPE: Vector; Polygon

DESCRIPTION OF CONTENT:
     This data set consists of geologic formations in Arizona.
     
FORMAT:  Arc/Info     

DATA SIZE:                  Data Set     7.5' quad
Approximate Megabytes:        2.2             -
     
HISTORY:
     This coverage was digitzed in 1992 by the USBLM from the Geologic Map 
of Arizona by Stephen J. Reynolds, Arizona Geological Survey, 1988 at a 
scale of 1:1,000,000. It was also splined using a weed and grain
tolerance of 150 meters for cartographic quality and the resultant coverage 
is called GEOSPLINE (5.3 megabytes) also located at /gis/covers/geo.  

MAINTENANCE:  NONE

PROJECTION:  NAD 27, UTM Zone 12, meters

ITEMS:
Item name: 	 AREA
Description:     The value of each polygon in square meters
Format:   	 4,12,F,3
Code Table:
     
Item name:	 PERIMETER
Description:     Perimeter of the polygon arcs in meters
Format:   	 4,12,F,3
Code table:

Item name:	 AZGEOLOGY# 
Description:     This is a unique internally assigned identification number 
		 for each polygon
Format:		 4,5,B
Code table:

Item name:	 AZGEOLOGY-ID
Description:     User assigned identification number for each polygon
Format:   	 4,5,B
Code table:

Item name:	 DATA
Description:     Geologic Map Unit Identification Code 
Format:   	 30,30,C

Code table:
Qy -  YOUNG ALLUVIUM (Holocene to latest Pleistocene)
Q -   SURFICIAL DEPOSITS (Holocene to middle Pleistocene)
Qo -  OLDER SURFICIAL DEPOSITS (middle Pleistocene to latest Pliocene)
QTb - BASALTIC ROCKS (Holocene to late Pliocene: 0 to 4 Ma.)
QTv - VOLCANIC ROCKS (Quaternary to late Pliocene)
Tsy - SEDIMENTARY ROCKS (Pliocene to middle Miocene)
Tby - BASALTIC ROCKS (Pliocene to late Miocene; 4 to 8 Ma.)
Tvy - VOLCANIC ROCKS (Pliocene to middle Miocene; 4 to 15 Ma.
Tb -  BASALTIC ROCKS (late to middle Miocene; 8 ro 16 Ma.)
Tsm - SEDIMENTARY ROCKS (middle Miocene to Oligocene; 15 to 38 Ma.)
Tv -  VOLCANIC ROCKS (middle Miocene to Oligocene; 15 to 38 Ma.)
Tsv - VOLCANIC AND SEDIMENTARY ROCKS (middle Miocene to Oligocene)
Ti -  SUBVOLCANIC INTRUSIVE ROCKS (middle Miocene to Oligocene)
Tg -  GRANITOID ROCKS (early Miocene to Oligocene; 18 to 38 Ma.)
Tso - SEDIMENTARY ROCKS (Oligocene to Eocene or locally Paleocene)
TKgm -GRANITIC ROCKS (early Tertiary to late Cretaceous; 45 to 75 Ma.)
TKg - GRANITOID ROCKS (early Tertiary to late Cretaceous; 55 to 85 Ma.)
Kv -  VOLCANIC ROCKS (late Cretaceous; early Tertiary near Safford)
Kmv - MESAVERDE GROUP (late Cretaceous)
Ks -  SEDIMENTARY ROCKS (Cretaceous)
KJs - SEDIMENTARY ROCKS WITH LOCAL VOLCANIC UNITS (Cretaceous to late Jurassic)
Jm -  MORRISON FORMATION (late Jurassic)
Js -  SAN RAFAEL GROUP (late to middle Jurassic)
Jgc - GLEN CANYON GROUP (early Jurassic)
Jg -  GRANITOID ROCKS (Jurassic)
Jsv - SEDIMENTARY AND VOLCANIC ROCKS (Jurassic)
Jv -  VOLCANIC ROCKS (Jurassic; locally latest Triassic)
JTr - SEDIMENTARY AND VOLCANIC ROCKS (Jurassic and early Triassic)
TrC - CHINLE FORMATION (late Triassic)
TrM - MOENKOPI FORMATION (middle[?]and early Triassic)
Mzo - OROCOPIA SCHIST (Jurassic protolith; Creataceous metamorphism)
MzPz -MESOZOIC AND PALEOZOIC ROCKS (structurally complex Jurassic,
       Triassic, and Paleozoic rocks in west-central Arizona)
Pz -  PALEOZOIC ROCKS (undifferentiated)
P -   SEDIMENTARY ROCKS (Permian)
PP -  SEDIMENTARY ROCKS (Permian and Pennsylvanian)
MC -  SEDIMENTARY ROCKS (Mississippian to Cambrian)
Ys -  SEDIMENTARY ROCKS (middle Proterozoic)
Yd -  DIABASE (middle Proterozoic; 1100 Ma.)
Yg -  GRANITOID ROCKS (middle Proterozoic; 1400 Ma.)
YXg - GRANITOID ROCKS (middle or early Proterozoic; 1400 Ma or 1650 to 1750 Ma.)
Xg -  GRANITOID ROCKS (early Proterozoic; 1400 Ma. or 1650 to 1750 Ma.)
Xq -  QUARTZITE (early Proterozoic; 1700 Ma.)
Xm -  METAMORPHIC ROCKS (early Proterozoic; 1650 to 1800 Ma.)
Xms - METASEDIMENTARY ROCKS (early Proterozoic; 1650 to 1800 Ma.)
Xmv - METAVOLCANIC ROCKS (early Proterozoic; 1650 to 1800 Ma.)