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View down Arecibo River from sharp bend at Kilometer 58, Hectometer 5 on Arecibo-Ponce road. Valley here cut in igneous rocks etc. of older series. Arecibo County, Puerto Rico. February 1922.
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Section along Cajon Creek, near junction with Lone Pine Canyon, near south 1/4 corner sec. 12, T. 2 N., R. 6 W., showing contact between old alluvium and underlying metamorphic rocks. San Bernardino County, California. October 18, 1919.
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The Castle Rock in Boulder Canyon. The canyon is about 17 miles in length, cutting deep down through the metamorphic rocks of the foothills, so that in some places the sides of the canyon rise up nearly 3,000 feet above its bed. Boulder County, Colorado. 1873.
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Album caption: Proposed Rocky Mountain (Estes) National Park, Colorado. Elephant Rocks, immediately north of Estes Park Valley. Picture by R.B. Marshall, Chief Geographer, 1912. Handwritten notes on album caption: Longs Peak quad., Larimer County Index card: Proposed Rocky Mountain (Estes) National Park. Elephant rocks, immediately north of Estes Park Valley. Longs Peak quadrangle, Larimer County, Colorado. 1912. (Photo by R.B. Marshall) (Spot on negative).
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Album caption: Drumlin profile from the north. NW 1/4, sec. 5, T. 5 N., R. 12 E. Stoughton quadrangle. Dane County, Wisconsin. July 21, 1902.
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Large sand-filled mud cracks in the basal part of the Carmel formation on the southeast flank of Boundary Butte anticline, 3 miles west of Red Mesa. Apache County, Arizona, n.d. (photo by C.H. Dane. Similiar to Dane photo 100). Published as figure 23 in U. S. Geological Survey. Professional paper 291. 1957.
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Album caption: Glacier National Park. Mountain crest north of railway from Summit to Firebrand Pass. Pre-Cambrian rocks at top, Cretaceous below. Glacier County, Montana. July 6, 1911.
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Colorado National Monument, Colorado. Ladder Creek Monocline and Redlands Fault. View is northwest from a point near Little Park Road east of the monument. No Thoroughfare Canyon in the foreground, which is bordered on the left by northeastward-dipping beds of Wingate Sandstone at the northwest end of Ladder Creek Monocline. Old Serpents Trail, the lower part of which is barely visible, ascends this dipping block of rock. The dark Proterozoic rocks form the flat-topped bluff on the right and are exposed by the Redlands Fault which lies just above the sharply upturned remnants of the Wingate Sandstone. 1976. Figure 29, U.S. Geological Survey Bulletin 1508.
Eight extinguishing powders KC1, were tested on five types of diffusion flames. The effect of flame temperature on the inhibition efficiency was investigated by varying the oxygen index of the flame supporting atmosphere. In addition a spectrographic investigation of powder - flame dissociation products was carried out on the methane /air /ABC (NH4H2PO4) flame. Dissociation products for this flame included PO, PH, NH, and Na. It is concluded that the main factor to be considered in the efficiency of the powder is the flame temperature. Purple K (KHCO3) was typically inefficient in low temperature flames and very efficient in high temperature flames. On the other hand, ABC . (NH4H2PO4) was found to lose its efficiency...
Tags: Coal
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As part of a cooperative project during 1986 and 1987, personnel from the U.S. Bureau of Mines and State of Alaska Division of Geological and Geophysical Surveys studied the mineral development potential of the Chilkat Peninsula and Islands, Alaska, as part of the larger Juneau Mining District study. About 4/5 of the area is within the Alaska State Chilkat and Chilkat Islands State Parks and not open to mineral entry. This study located four new (or previously unreported) gold- copper prospects. One of these, the Road Cut prospect, was examined by trenching, drilling and geophysics. While sufficient grades and tonnages were not delineated by this work to constitute an economic deposit, they are sufficient to encourage...
map background search result map search result map Drumlin profile from the north. Dane County, Wisconsin, 1902. Mountain crest north of railway from Summit to Firebrand Pass. Glacier National Park. Glacier County, Montana. 1911. Large sand-filled mud cracks in the basal part of the Carmel formation on the southeast flank of Boundary Butte anticline. Apache County, Arizona. No date. The Castle Rock in Boulder Canyon. Boulder County, Colorado. 1873. Ladder Creek Monocline and Redlands Fault. Colorado National Monument, Colorado. 1976. Cajon Creek. San Bernardino County, California. 1919. Elephant Rocks, Rocky Mountain National Park. Larimer County, Colorado. 1912. WMR 405 - Esperanza Property. Pima County, Arizona. 1945. WMR 424 - Tungsten Metals Corporation Minerva Mining District. White Pine County, Nevada. 1945. WMR 428 - Summary of Arkansas Bauxite Exploration During 1944. Arkansas. 1945. WMR 436 - Apex Property. Coconino County, Arizona. 1945. WMR 473 - High-Iron Clay Deposit. Latah County, Idaho. 1945. OFR 49-88 - Gold-Copper Mineralization of the Chilkat Peninsula & Islands, Alaska. 1988. OFR 49-88 - Gold-Copper Mineralization of the Chilkat Peninsula & Islands, Alaska. 1988. The Castle Rock in Boulder Canyon. Boulder County, Colorado. 1873. Drumlin profile from the north. Dane County, Wisconsin, 1902. WMR 473 - High-Iron Clay Deposit. Latah County, Idaho. 1945. Elephant Rocks, Rocky Mountain National Park. Larimer County, Colorado. 1912. WMR 424 - Tungsten Metals Corporation Minerva Mining District. White Pine County, Nevada. 1945. WMR 405 - Esperanza Property. Pima County, Arizona. 1945. Large sand-filled mud cracks in the basal part of the Carmel formation on the southeast flank of Boundary Butte anticline. Apache County, Arizona. No date. Cajon Creek. San Bernardino County, California. 1919. WMR 436 - Apex Property. Coconino County, Arizona. 1945. WMR 428 - Summary of Arkansas Bauxite Exploration During 1944. Arkansas. 1945.