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Temporal and spatial sources of silica for chert remain poorly constrained. Modern sources to the worlds oceans include silica in rivers > aeolian (dust) deposition > sea floor vents and submarine weathering. However, changes in aridity and dust flux during the Phanerozoic may explain variations in the ocean silica cycle and times and places of chert formation. The chemistry of fine quartz dust (FQD) provides a chemical mechanism for the transformation of FQD to polymorphs of silica in chert; FQD is readily dissolved, then reprecipitated as Opal-A by either biotic or abiotic processes. An unequivocal relation between increases in dust flux and biogenic opal-A in the western Pacific Ocean during the past 200 kyr...
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During 2009, the Alaska Division of Geological & Geophysical Surveys continued a program, begun in 2006, of reconnaissance mapping of surficial geology in the proposed natural-gas pipeline corridor through the upper Tanana River valley. The study area is a 12-mi-wide (19.3-km-wide) area that straddles the Alaska Highway from the western boundaries of the Tanacross B-3 and A-3 quadrangles near Tetlin Junction eastward to the eastern boundaries of the Nabesna D-1 and C-1 quadrangles along the Canada border. Mapping during 2008-2009 in the Tanacross and Nabesna quadrangles linked with the mapping completed in the Tanacross, Big Delta and Mt. Hayes quadrangles in 2006-2008. Surficial geology was initially mapped in...
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This map illustrates extents and types of unconsolidated deposits and bedrock in the Big Delta A-4 Quadrangle, Alaska. This map is based on field observations begun by P�w� in 1949 and by Reger in 1976. Unit characteristics and extents were determined during field visits and by interpreting 1:40,000-scale black-and-white aerial photographs taken in August 1949 and 1:63,360-scale, false-color infrared aerial photographs taken in July 1978, August 1980, and August 1981.
Core Research Center, core E941, from well operated by ENCANA ENERGYRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "E941", "API Num": "0512320883", "Operator": "ENCANA ENERGY", "Well Name": "32-4 OLIN", "Field": "WATTENBERG", "State": "CO", "County": "WELD", "Type": "SLABBED", "Photos": "F", "Thin Sec": "F", "Analysis": "T", "Latitude": "40.082549", "Longitude": "-104.666556", "coordinates_geohash": "9xjs42b1u2xn", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "DAKOTA", "Age": "CRET", "Min Depth": "7866", "Max Depth": "7867"}, {"Formation": "DAKOTA",...
Core Research Center, core A838, from well operated by BROOKS EXPLORATIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "A838", "API Num": "0512308547", "Operator": "BROOKS EXPLORATION", "Well Name": "1 M LEFFLER", "Field": "WILDCAT", "State": "CO", "County": "WELD", "Type": "SLABBED", "Photos": "T", "Thin Sec": "F", "Analysis": "T", "Latitude": "40.479173", "Longitude": "-104.785343", "coordinates_geohash": "9xjqr918k8c0", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "SUSSEX", "Age": "CRET", "Min Depth": "4380", "Max Depth": "4412"}], "crcwc_url":...
Core Research Center, core B285, from well operated by AMOCO PRODUCTIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "B285", "API Num": "1518720227", "Operator": "AMOCO PRODUCTION", "Well Name": "1 H L CULLERS", "Field": "PANOMA GAS AREA", "State": "KS", "County": "STANTON", "Type": "SLABBED", "Photos": "T", "Thin Sec": "F", "Analysis": "F", "Latitude": "37.481194", "Longitude": "-101.768575", "coordinates_geohash": "9wxthpnru2fr", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "COUNCIL GROVE", "Age": "PERM", "Min Depth": "2610", "Max Depth": "2730"}],...
Core Research Center, cutting DZ16290, from well operated by AMOCO PRODUCTIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ16290", "API Num": "0512308706", "Operator": "AMOCO PRODUCTION", "Well Name": "1 CHAMPLIN 311 A", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.598422", "Longitude": "-104.689211", "coordinates_geohash": "9xjwcwxwuw6k", "Source": "FROM STATE RECORDS", "Min": "550", "Max": "8330", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/39938",...
Core Research Center, cutting DZ19909, from well operated by FIRST ENERGY CORP.Raw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ19909", "API Num": "1510920301", "Operator": "FIRST ENERGY CORP.", "Well Name": "44-35 NUSS FARMS", "Field": "WILDCAT ", "State": "KS", "County": "LOGAN", "Thin Sec": "F", "Analysis": "F", "Latitude": "38.8814534", "Longitude": "-100.8446815", "coordinates_geohash": "9ybm1nphus5r", "Source": "FROM STATE RECORDS", "Min": "3290", "Max": "4660", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/43215",...
Core Research Center, cutting DZ14658, from well operated by AMOCO PRODUCTIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ14658", "API Num": "0512307289", "Operator": "AMOCO PRODUCTION", "Well Name": "1-C-21 PAN AM-UPPR", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "T", "Latitude": "40.23674", "Longitude": "-104.75038", "coordinates_geohash": "9xjsbkg5gpzr", "Source": "FROM STATE RECORDS", "Min": "510", "Max": "7970", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/38124",...
Core Research Center, cutting DZ19876, from well operated by HERSHEY OILRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ19876", "API Num": "0512311540", "Operator": "HERSHEY OIL", "Well Name": "1-35 WILSON", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.537913", "Longitude": "-104.750622", "coordinates_geohash": "9xjw87dymwen", "Source": "FROM STATE RECORDS", "Min": "6490", "Max": "7990", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/43072",...
Core Research Center, cutting DZ14664, from well operated by AMOCO PRODRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ14664", "API Num": "0512307262", "Operator": "AMOCO PROD", "Well Name": "1 PANSY R HANKINS", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.387754", "Longitude": "-104.910406", "coordinates_geohash": "9xjmu8qedr52", "Source": "FROM STATE RECORDS", "Min": "210", "Max": "7745", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/38130",...
Core Research Center, cutting DZ16553, from well operated by COLORADO INTERSTATE GASRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ16553", "API Num": "1512920247", "Operator": "COLORADO INTERSTATE GAS", "Well Name": "31 BOEHM", "Field": "BOEHM ", "State": "KS", "County": "MORTON", "Thin Sec": "F", "Analysis": "F", "Latitude": "37.1901719", "Longitude": "-101.8738132", "coordinates_geohash": "9wxe9f3b2ne0", "Source": "FROM STATE RECORDS", "Min": "1500", "Max": "4950", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/40974",...
Core Research Center, cutting DZ14471, from well operated by AMOCO PRODUCTIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ14471", "API Num": "0512307224", "Operator": "AMOCO PRODUCTION", "Well Name": "1-49 UPRR", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.306915", "Longitude": "-104.884034", "coordinates_geohash": "9xjmm39ubcec", "Source": "FROM STATE RECORDS", "Min": "230", "Max": "7845", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/37382",...
Core Research Center, cutting DZ14306, from well operated by TOM VESSELSRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ14306", "API Num": "0512307177", "Operator": "TOM VESSELS", "Well Name": "1 MATHEWS", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.056599", "Longitude": "-104.737828", "coordinates_geohash": "9xjebsh4xeqb", "Source": "FROM STATE RECORDS", "Min": "7200", "Max": "8125", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/38845",...
Core Research Center, cutting DZ16149, from well operated by PANHANDLE PRODRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ16149", "API Num": "0500107097", "Operator": "PANHANDLE PROD", "Well Name": "12-16B DARLOW UNIT", "Field": null, "State": "CO", "County": "ADAMS", "Thin Sec": "F", "Analysis": "F", "Latitude": "39.973769", "Longitude": "-104.942943", "coordinates_geohash": "9xj77vnbh4wh", "Source": "FROM STATE RECORDS", "Min": "4790", "Max": "8775", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/39352",...
Core Research Center, cutting DZ19731, from well operated by PETROMAX ENERGYRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ19731", "API Num": "0512311452", "Operator": "PETROMAX ENERGY", "Well Name": "1-1 SEEWALD", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.249975", "Longitude": "-104.948936", "coordinates_geohash": "9xjkgz690e1m", "Source": "FROM STATE RECORDS", "Min": "2500", "Max": "7400", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/42483",...
Core Research Center, cutting DZ01444, from well operated by OCCIDENTAL PETRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ01444", "API Num": "0512306144", "Operator": "OCCIDENTAL PET", "Well Name": "1 OLSON", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.268045", "Longitude": "-104.996318", "coordinates_geohash": "9xjm4f8427wu", "Source": "FROM STATE RECORDS", "Min": "450", "Max": "9318", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/32119",...
Core Research Center, cutting DZ19708, from well operated by AMERICAN PETROFINARaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ19708", "API Num": "1502320174", "Operator": "AMERICAN PETROFINA", "Well Name": "1 WILMER HILT", "Field": "CHERRY CREEK NIOBRARA GAS AREA ", "State": "KS", "County": "CHEYENNE", "Thin Sec": "F", "Analysis": "F", "Latitude": "39.7943829", "Longitude": "-102.0233292", "coordinates_geohash": "9xp6qkkgh4eu", "Source": "FROM STATE RECORDS", "Min": "1400", "Max": "4100", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}],...
Core Research Center, cutting DZ14796, from well operated by AMOCO PRODRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ14796", "API Num": "0512307376", "Operator": "AMOCO PROD", "Well Name": "2 WILLIAM LARSDOWN", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.118208", "Longitude": "-104.78024", "coordinates_geohash": "9xjkpxm3e2n2", "Source": "FROM STATE RECORDS", "Min": "240", "Max": "4980", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/38706",...
Core Research Center, cutting DZ14480, from well operated by AMOCO PRODUCTIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ14480", "API Num": "0512307235", "Operator": "AMOCO PRODUCTION", "Well Name": "43-C-1 UPRR", "Field": null, "State": "CO", "County": "WELD", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.016708", "Longitude": "-104.954364", "coordinates_geohash": "9xj7esyd4p41", "Source": "FROM STATE RECORDS", "Min": "190", "Max": "8470", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/37391",...


map background search result map search result map Engineering-geologic map of the Alaska Highway corridor, Tetlin Junction to Canada border, Alaska Geologic map of the Big Delta A-4 Quadrangle, Alaska The chemistry of eolian quartz dust and the origin of chert Core Research Center Core A838 Core Research Center Core B285 Core Research Center Core E941 Core Research Center Cutting DZ01444 Core Research Center Cutting DZ14306 Core Research Center Cutting DZ14471 Core Research Center Cutting DZ14480 Core Research Center Cutting DZ14658 Core Research Center Cutting DZ14664 Core Research Center Cutting DZ14796 Core Research Center Cutting DZ16149 Core Research Center Cutting DZ16290 Core Research Center Cutting DZ16553 Core Research Center Cutting DZ19708 Core Research Center Cutting DZ19731 Core Research Center Cutting DZ19876 Core Research Center Cutting DZ19909 Geologic map of the Big Delta A-4 Quadrangle, Alaska Engineering-geologic map of the Alaska Highway corridor, Tetlin Junction to Canada border, Alaska The chemistry of eolian quartz dust and the origin of chert