1505.5. 1488.7. 1541.2. DH - 3. DH - 1. DH - 4. DH -8. DH - 2. A '. A. 0 m. 0 m. 500
m. DH - 7. DH - 6. DH - 5. 27. 26. 23. 16. 28. Scale 1:1,000. Contour interval 5 ...
U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY
MISCELLANEOUS FIELD STUDIES MAP MF–2380 Version 1.0 Pamphlet accompanies map CORRELATION OF MAP UNITS 25
1550 15
Qc
Qc
Holocene
QUATERNARY
1525 Unconformity
15
Tnac
T - 15
00
Neogene
5
152
Tnas Tnacb
Tnas
Unconformity
S-2 400 m 14
00
Qc
T-4
15
28
Tnacb
Paleogene
75
Ti
T - 11
TERTIARY
DESCRIPTION OF MAP UNITS
1505.5 Qc
1500
DH - 5
Nor Arevik Deposit (Neogene)—A terrestrial deposit divisible into three distinct units: in ascending order, coal bearing, sandstone, and conglomerate. The upper two units are commonly missing. Deposit covers only 2.75 km2 at the Nor Arevik coal site. Considered Miocene, or early or middle Pliocene in age by previous workers; generalized in our report as Neogene. As thick as 475 m
S-3 T-5 T - 13
Tnac
Conglomerate unit—Clast-supported conglomerate containing subangular to subrounded, pebbles to boulders of various intrusive igneous rocks. Weathers light brown to bluish gray. Includes some lenticular interbeds of medium-grained to very coarse grained sandstone. Erosional contact with underlying unit. As thick as 400 m
Tnas
Sandstone unit—Poorly sorted, very fine to very coarse grained sandstone consisting of subangular to subrounded grains of quartz and lithic fragments. Weathers light brown. Includes some lenticular bodies of matrix-supported conglomerate similar in composition to the overlying conglomerate unit. Conformable contact with underlying unit. Unit ranges from 5 to 48 m thick
0
150
1525
A
Myulk Creek
Tnac
Holocene deposits—Gravel, sand, silt, and clay. As thick as 30 m
5
300 m
147
DH -8 DH - 6 S -1 T-2
Tnacb Tnas
DH - 2
Tnacb
Ti
1541.2
Coal-bearing unit—Mostly mudstone, combustible shale, and coal. Mudstone is carbonaceous and weathers dark gray; ironstone concretions are rare. Combustible shale is fissile and weathers dark brown; bed thickness ranges from 5 cm to 3.3 m and fossil plant debris are common. Coal is subbituminous and occurs in two zones in upper one-third of unit; coal bed thickness ranges from 2 cm to 1.6 m. Very thin to thin beds of siltstone are common throughout unit, and very thin beds of very fine grained sandstone are rare in lower part of unit. Light-yellowish-brown-weathering, thin-bedded, argillaceous limestone occurs locally in upper one-third of unit; plant and mollusk fossils are common. A basal conglomerate 19 m thick fills a erosional depression in underlying igneous rock at one location. Ranges from 10 to 25 m thick
T - 10
1488.7
T - 12
DH - 4 200 m
DH - 1
T - 14
26
16
Ti
Intrusive rocks (Paleogene)—Various acidic to basic intrusive igneous rocks; granodiorite predominates
S-5 152 5
T-9
23
5
147
DH - 7
S-4
1500
1500
A'
T-7 T - 16
Contact—Approximately located
23
Strike of bedding—Showing dip direction
50
15
Tnacb
T-6
27
Strike and dip of bedding
100 m
Mine—Includes trenches T - 3 and T - 8
Ti
DH - 3 T-1
DH - 8
147
Drill hole—Drilled by Drobotova and Saponjian, between 1993 and 1996
5
Tnac
T-6
Trench—Cut by Drobotova and Saponjian, between 1993 and 1996
Ti S-3
Tnas
My
ulk
1475
Shaft—Dug by Drobotova and Saponjian, between 1993 and 1996
1450
Cr
eek
0m
Qc Base from Tarayan (1942). Original contour interval 5 m. Based on a Geographic Positioning System (GPS) reading, lat 39°01'20" N. and long 46°12'15" E. lie within the Nor Arevik coal site. Digitized by Gourgen Malkhassian.
400 m
300 m
200 m
100 m
0m
Building
Mapped by Edward A. Johnson, Artur Martirosyan, and Brenda S. Pierce, June 1999. Modified from Tarayan (1942) and Drobotova and Saponjian (1996).
Scale 1:1,000 200 m
100 m
0m
500 m
Stream
Manuscript approved for publication January 22, 2002 1541.2
Contour interval 5 m
A
A
A' METERS 1550
1525
1525
Myulk Creek
A' Line of cross section
METERS 1550
1500
Survey point—Elevation in meters
1500
Tnac 1475
1475
Tnas
Ti 1450
1450
1
Tnacb
GEOLOGIC MAP OF THE NOR AREVIK COAL SITE, SOUTHERN ARMENIA By Edward A. Johnson1, Artur Martirosyan2, Brenda S. Pierce3, Gourgen Malkhassian2, and Michael E. Brownfield1 2002
U.S. Geological Survey, Denver, CO 80225 2 U.S. Geological Survey Armenian Staff, Yerevan, Armenia 3 U.S. Geological Survey, Reston, VA 20192
Any use of trade names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey This map was produced on request, directly from digital files, on an electronic plotter For sale by U.S. Geological Survey Information Services Box 25286, Federal Center, Denver, CO 80225 1-888-ASK-USGS This map is also available as a PDF at http://geology.cr.usgs.gov/greenwood-pubs.html
