Sample |
State |
Elev |
Elev |
Northing |
Easting |
Thickness |
Notes |
geometry |
geom |
10Be model age |
10Be (SL, >60o) |
10Be measured |
thick |
|
|
(ft) |
(m) |
(m) |
(m) |
(cm) |
|
|
factor |
(ky) |
(106 atom g-1) |
(106 atom g-1) |
factor |
gf20 |
VA |
183.2 |
55.9 |
305679.0 |
4316938.2 |
2 |
sample from rock surface overlooking gorge immediately
next to trail. Quartz is in high relief (>2 cm). Sample is mostly qtz.
The sample is below Glade Hill but above the 140' level. Appears to be very
weathered. Not sure if old water polished surface |
15 degree slope. No other correction. |
0.997 |
21.8 |
± |
2.6 |
0.112 |
± |
0.007 |
0.107 |
± |
0.006 |
1.02 |
gf21 |
VA |
138.9 |
42.3 |
305651.5 |
4316939.5 |
2 |
sample from well rounded, water worn out crop
with less qtz relief than GF-20. Sample is mix of schist and vein quartz. |
flat. 20 deg shield over 90 deg, 10 deg shield
over 45 deg |
0.992 |
37.1 |
± |
3.9 |
0.190 |
± |
0.006 |
0.178 |
± |
0.006 |
1.02 |
gf22 |
VA |
129.4 |
39.5 |
305663.1 |
4316947.2 |
3 |
sample is about 10' below GF21 on cross section.
This is a very well rounded outcrop, clearly water won. Not much vein qtz
relief. Heavy lichen cover. |
flat. 25 deg shield over 45 deg, 60 deg shield
over 45 deg, 45 deg shield over 45, 15 deg over 45 |
0.874 |
27.7 |
± |
3.0 |
0.142 |
± |
0.005 |
0.116 |
± |
0.004 |
1.02 |
gf23 |
VA |
112.2 |
34.2 |
305663.7 |
4316954.0 |
4 |
sample is one of three waterworn and polished
outcrops at about the same level (compare GF 24 and 25). Qtz is less than
1 cm in relief. There is some to sample. GF 24 is 10m to the east of GF
23. GF 3 is higher by about 4 to 5' than GF 24 and 25 which |
flat. 25 deg shield over 45 deg, 35 deg shield
over 45 deg, 25 deg shield over 45, 10 deg over 45 |
0.865 |
22.8 |
± |
2.4 |
0.117 |
± |
0.004 |
0.094 |
± |
0.003 |
1.03 |
gf24 |
VA |
107.4 |
32.7 |
305673.1 |
4316956.8 |
5 |
very well rounded outcrop with numerous pits
and potholes. Slight qtz relief (0.5 cm) 3 meter long imbricated schist
clasts nearby. |
flat. 22 deg shield over 45 deg, 22 deg shield
over 45 deg, 32 deg shield over 45, 10 deg over 45 |
0.974 |
ND |
± |
ND |
ND |
± |
ND |
ND |
± |
ND |
1.04 |
gf25 |
VA |
106.1 |
32.4 |
305681.1 |
4316952.0 |
4 |
flat surface with quartz vein relief of about
0.5 cm, plucked blocks nearby |
flat. 25 deg shield over 45 deg,40 deg shield
over 45 deg, 40 deg shield over 45, 10 deg over 45 |
0.934 |
20.0 |
± |
2.2 |
0.103 |
± |
0.005 |
0.089 |
± |
0.004 |
1.03 |
gf26 |
VA |
90.6 |
27.6 |
305665.0 |
4316963.1 |
4 |
about 15' lower than samples GF23-25. Taken
from dip slope of about 10deg, smooth, water polished joint face. Slight
qtz relief < 0.5 cm |
10 deg slope. 30 deg shield over 45 deg,25 deg
shield over 45 deg, 25 deg shield over 45, 10 deg over 45 |
0.972 |
ND |
± |
ND |
ND |
± |
ND |
ND |
± |
ND |
1.03 |
gf27 |
VA |
81.3 |
24.8 |
305673.5 |
4316964.5 |
2 |
about 8 to 10' lower than GF26. Taken form vertical
joint, flat face sampled that is horizontal joint. Very smooth. No qtz relief.
No dip. Good potholes and flow features |
flat. 35 deg shield over 45 deg, 40 deg shield
over 45 deg, 30 deg shield over 45, 15 deg over 45 |
0.937 |
16.9 |
± |
1.9 |
0.087 |
± |
0.004 |
0.076 |
± |
0.003 |
1.02 |
gf28 |
VA |
77.1 |
23.5 |
305650.2 |
4316969.5 |
4 |
taken from lowest platform above water level.
Muddy, rough surface with bivalves. Sample from joint. No qtz weathering.
Top of flat surface near pothole. About 8 to 10' lower than GF 27. Several
feet above water level. |
flat. 25 deg shield over 45 deg, 30 deg shield
over 45 deg, 25 deg shield over 45, 15 deg over 45 |
0.971 |
12.7 |
± |
1.5 |
0.066 |
± |
0.004 |
0.058 |
± |
0.003 |
1.03 |
gf29 |
VA |
128.1 |
39.1 |
305477.7 |
4317076.8 |
6 |
weathered rock outcrop with flow rounded shape.
About 4 m long and 1.5 m above forest floor. Qtz is 1 cm above schist. Breaks
off easily. On broad 140' surface adjacent to trail. |
none |
1 |
38.1 |
± |
4.1 |
0.195 |
± |
0.008 |
0.178 |
± |
0.007 |
1.05 |
gf30 |
VA |
104.6 |
31.9 |
305471.0 |
4317214.5 |
5 |
very well polished outcrop with potholes. Below
the 140' level. Outcrop at top of gorge near sandy landing road. Area nearby
is all outcrop. |
none |
1 |
29.3 |
± |
3.4 |
0.150 |
± |
0.009 |
0.137 |
± |
0.008 |
1.04 |
gf31 |
VA |
154.2 |
47.0 |
305393.8 |
4317349.1 |
8 |
Tope of gorge on or above 140' surface above
the quarry wall. This is a weathered knob which stands about 2 m above the
surrounding topography. Many other accordant knobs nearby. |
none |
1 |
77.9 |
± |
8.3 |
0.396 |
± |
0.012 |
0.375 |
± |
0.011 |
1.02 |
gf32 |
VA |
145.0 |
44.2 |
305331.3 |
4317610.5 |
2 |
very open area of waterworn rock where climbers
are. 1 cm of qtz relief. Area is all out crop, more than 10 m long and 1-2
m above ground surface. |
none |
1 |
38.8 |
± |
4.2 |
0.199 |
± |
0.008 |
0.188 |
± |
0.007 |
1.02 |
gf33 |
VA |
154.2 |
47.0 |
304997.7 |
4318280.3 |
3 |
rock outcrop covered in potholes near the river
trail by the picnic area. Has 1-2 cm of qtz relief. Sample mostly from qtz
veins. Sampled surface has flat top |
none |
1 |
32.4 |
± |
3.4 |
0.166 |
± |
0.005 |
0.156 |
± |
0.005 |
1.02 |