| 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 |