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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.
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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...
Core Research Center, core D105, from well operated by MONSANTO OILRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "D105", "API Num": "0508306420", "Operator": "MONSANTO OIL", "Well Name": "6-15 UTE MTN TRIBAL", "Field": "MARBLE WASH", "State": "CO", "County": "MONTEZUMA", "Type": "SLABBED", "Photos": "F", "Thin Sec": "T", "Analysis": "T", "Latitude": "37.19343", "Longitude": "-109.013232", "coordinates_geohash": "9wd7x6fgrtfs", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "ISMAY", "Age": "PENN", "Min Depth": "5774", "Max Depth": "5830"}, {"Formation":...
Core Research Center, core A474, from well operated by GIBSON J WRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "A474", "API Num": "0512109029", "Operator": "GIBSON J W", "Well Name": "B-1 SHEETZ", "Field": "KACHINA", "State": "CO", "County": "WASHINGTON", "Type": "SLABBED", "Photos": "T", "Thin Sec": "T", "Analysis": "T", "Latitude": "39.786459", "Longitude": "-103.174167", "coordinates_geohash": "9xndk4yugtt0", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "DAKOTA J", "Age": "CRET", "Min Depth": "4265", "Max Depth": "4290"}], "crcwc_url": "https://my.usgs.gov/crcwc/core/report/8551",...
Core Research Center, core U308, from well operated by WESTERN NUCLEARRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "U308", "API Num": null, "Operator": "WESTERN NUCLEAR", "Well Name": "1 BM - BLUE MOUNTAIN", "Field": "BLUE MOUNTAIN PIPE", "State": "AZ", "County": "COCONINO", "Type": "CUTTINGS", "Photos": "F", "Thin Sec": "F", "Analysis": "F", "Latitude": "35.6949780669572", "Longitude": "-113.185162255308", "coordinates_geohash": "9qre06j46d1y", "Source": "CENTER OF QUARTER SECTION", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "UNKNOWN", "Age": "PERM", "Min Depth": "0", "Max...
Core Research Center, core U223, from well operated by PACIFIC ENERGY & MINRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "U223", "API Num": null, "Operator": "PACIFIC ENERGY & MIN", "Well Name": "2 HORSE PRAIRIE D D", "Field": "TERTIARY BASIN PROJ", "State": "MT", "County": "BEAVERHEAD", "Type": "FULL", "Photos": "F", "Thin Sec": "F", "Analysis": "F", "Latitude": "44.941452", "Longitude": "-113.026695", "coordinates_geohash": "9rzxsj26zjge", "Source": "CENTER OF QUARTER SECTION", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "OLIGOCENE", "Age": "QUAT", "Min Depth": "0", "Max Depth":...
Core Research Center, core B099, from well operated by AMOCO PRODUCTIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "B099", "API Num": "1505520274", "Operator": "AMOCO PRODUCTION", "Well Name": "1 CONGDON", "Field": "CONGDON", "State": "KS", "County": "FINNEY", "Type": "SLABBED", "Photos": "T", "Thin Sec": "T", "Analysis": "F", "Latitude": "38.020154", "Longitude": "-100.844846", "coordinates_geohash": "9yb231r52y2s", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "ST LOUIS", "Age": "MISS", "Min Depth": "4750", "Max Depth": "4840"}], "crcwc_url":...
Core Research Center, core R034, from well operated by PLAINS EXPLORATIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "R034", "API Num": "0512105877", "Operator": "PLAINS EXPLORATION", "Well Name": "D-1 E S HOOD", "Field": "SAPPHIRE", "State": "CO", "County": "WASHINGTON", "Type": "FULL", "Photos": "F", "Thin Sec": "F", "Analysis": "T", "Latitude": "39.854717", "Longitude": "-103.533678", "coordinates_geohash": "9xn6sp34d3wr", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "DAKOTA", "Age": "CRET", "Min Depth": "4885", "Max Depth": "4914"}], "crcwc_url":...
Core Research Center, core T404, from well operated by CIRQUE RESOURCESRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "T404", "API Num": "4902120639", "Operator": "CIRQUE RESOURCES", "Well Name": "V.O. CHILD #30-9", "Field": "WILDCAT", "State": "WY", "County": "LARAMIE", "Type": "THIN SLAB", "Photos": "T", "Thin Sec": "T", "Analysis": "T", "Latitude": "41.24061", "Longitude": "-104.69988", "coordinates_geohash": "9xmd97xggyzj", "Source": "PROVIDED BY DONOR", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "SHARON SPRINGS", "Age": "CRETACEOUS", "Min Depth": "8417", "Max Depth": "8457"},...
Core Research Center, core U627, from well operated by U S ERDARaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "U627", "API Num": null, "Operator": "U S ERDA", "Well Name": "1 SAMS CANYON", "Field": null, "State": "UT", "County": "DUCHESNE", "Type": "SPLIT", "Photos": "T", "Thin Sec": "F", "Analysis": "F", "Latitude": "40.13706", "Longitude": "-110.65016", "coordinates_geohash": "9x1k64ep26k8", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "GREEN RIVER", "Age": "TERT", "Min Depth": "43", "Max Depth": "359"}], "crcwc_url": "https://my.usgs.gov/crcwc/core/report/15623",...
Core Research Center, core T988, from well operated by USGSRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "T988", "API Num": null, "Operator": "USGS", "Well Name": "OGALLALA WELL 1", "Field": null, "State": "WY", "County": "LARAMIE", "Type": "FULL", "Photos": "T", "Thin Sec": "F", "Analysis": "T", "Latitude": "41.0616", "Longitude": "-104.4624", "coordinates_geohash": "9xm9wghc1thb", "Source": null, "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "OGALLALA", "Age": "TERT", "Min Depth": "20", "Max Depth": "277"}, {"Formation": "WHITE RIVER", "Age": "TERT", "Min Depth": "278", "Max...
Core Research Center, core R001, from well operated by CHAMLEE-STUARCORaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "R001", "API Num": "0512106358", "Operator": "CHAMLEE-STUARCO", "Well Name": "1 PIONEER FARMS", "Field": "WILDCAT", "State": "CO", "County": "WASHINGTON", "Type": "CHIPS", "Photos": "F", "Thin Sec": "F", "Analysis": "T", "Latitude": "39.937258", "Longitude": "-102.951761", "coordinates_geohash": "9xng1q2g6h7p", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "DAKOTA D", "Age": "CRET", "Min Depth": "3943", "Max Depth": "3973"}, {"Formation":...
Core Research Center, core S604, from well operated by PANCANADIAN PET LTDRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "S604", "API Num": "1506522273", "Operator": "PANCANADIAN PET LTD", "Well Name": "4 SCHUCK 44-17", "Field": "PEN", "State": "KS", "County": "GRAHAM", "Type": "FULL", "Photos": "F", "Thin Sec": "F", "Analysis": "T", "Latitude": "39.52641", "Longitude": "-99.789818", "coordinates_geohash": "9z10c5x608ye", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "LANSING-KANSAS CITY", "Age": "PENN", "Min Depth": "3768", "Max Depth": "3796"}],...
Core Research Center, core C883, from well operated by MONSANTO OILRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "C883", "API Num": "4901321080", "Operator": "MONSANTO OIL", "Well Name": "1-10 PFIEFFER", "Field": "MADDEN", "State": "WY", "County": "FREMONT", "Type": "SLABBED", "Photos": "F", "Thin Sec": "F", "Analysis": "F", "Latitude": "43.2723", "Longitude": "-107.61443", "coordinates_geohash": "9xeqpjmx6j3h", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "PHAYLES", "Age": "CRET", "Min Depth": "16175", "Max Depth": "16234"}], "crcwc_url": "https://my.usgs.gov/crcwc/core/report/10939",...
Core Research Center, core D334, from well operated by SUNDANCE OILRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "D334", "API Num": "2612321420", "Operator": "SUNDANCE OIL", "Well Name": "1-19 PETERSON", "Field": "WILDCAT", "State": "NE", "County": "MORRILL", "Type": "SLABBED", "Photos": "T", "Thin Sec": "F", "Analysis": "F", "Latitude": "41.785203", "Longitude": "-103.166308", "coordinates_geohash": "9xqtsqu86y3h", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "DAKOTA J", "Age": "CRET", "Min Depth": "4355", "Max Depth": "4376"}], "crcwc_url": "https://my.usgs.gov/crcwc/core/report/11075",...
Core Research Center, core F053, from well operated by MARATHON OIL COMPANYRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "F053", "API Num": "4901720590", "Operator": "MARATHON OIL COMPANY", "Well Name": "6-31 MARATHON - AMERADA", "Field": "ADAM", "State": "WY", "County": "HOT SPRINGS", "Type": "SLABBED", "Photos": "T", "Thin Sec": "F", "Analysis": "T", "Latitude": "43.90247", "Longitude": "-108.77681", "coordinates_geohash": "9xf9u8pnkted", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "FRONTIER", "Age": "CRET", "Min Depth": "3682", "Max Depth":...
Core Research Center, core R522, from well operated by SUNRAY DX OILRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "R522", "API Num": "2508505242", "Operator": "SUNRAY DX OIL", "Well Name": "1 FORT PECK", "Field": "TULE CREEK EAST", "State": "MT", "County": "ROOSEVELT", "Type": "FULL", "Photos": "F", "Thin Sec": "F", "Analysis": "F", "Latitude": "48.369469", "Longitude": "-105.427649", "coordinates_geohash": "c8t50vmutdx1", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "NISKU", "Age": "DEVO", "Min Depth": "7784", "Max Depth": "7810"}, {"Formation":...
Core Research Center, core B012, from well operated by AMOCO PRODUCTIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "B012", "API Num": "0512309285", "Operator": "AMOCO PRODUCTION", "Well Name": "E-4 ROCKY MOUNTAIN", "Field": "SPINDLE", "State": "CO", "County": "WELD", "Type": "SLABBED", "Photos": "T", "Thin Sec": "F", "Analysis": "T", "Latitude": "40.10396", "Longitude": "-104.92654", "coordinates_geohash": "9xjkhkdy6rvp", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "SUSSEX", "Age": "CRET", "Min Depth": "4570", "Max Depth": "4661"}], "crcwc_url":...
Core Research Center, core A539, from well operated by ANSCHUTZ CORPORATIONRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "A539", "API Num": "0508706654", "Operator": "ANSCHUTZ CORPORATION", "Well Name": "1 WOLF", "Field": "WILDCAT", "State": "CO", "County": "MORGAN", "Type": "SLABBED", "Photos": "T", "Thin Sec": "F", "Analysis": "T", "Latitude": "40.521857", "Longitude": "-103.900995", "coordinates_geohash": "9xnne8v8gmdu", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "DAKOTA D", "Age": "CRET", "Min Depth": "6414", "Max Depth": "6427"}], "crcwc_url":...


map background search result map search result map 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 B099 Core Research Center Core A474 Core Research Center Core U308 Core Research Center Core R034 Core Research Center Core D105 Core Research Center Core U223 Core Research Center Core U627 Core Research Center Core T988 Core Research Center Core S604 Core Research Center Core C883 Core Research Center Core R001 Core Research Center Core B012 Core Research Center Core F053 Core Research Center Core R522 Core Research Center Core D334 Core Research Center Core A539 Core Research Center Core T404 Geologic map of the Big Delta A-4 Quadrangle, Alaska The chemistry of eolian quartz dust and the origin of chert