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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...
This data set contains imagery from the National Agriculture Imagery Program (NAIP). The NAIP program is administered by USDA FSA and has been established to support two main FSA strategic goals centered on agricultural production. These are, increase stewardship of America's natural resources while enhancing the environment, and to ensure commodities are procured and distributed effectively and efficiently to increase food security. The NAIP program supports these goals by acquiring and providing ortho imagery that has been collected during the agricultural growing season in the U.S. The NAIP ortho imagery is tailored to meet FSA requirements and is a fundamental tool used to support FSA farm and conservation programs....
This data set contains imagery from the National Agriculture Imagery Program (NAIP). The NAIP program is administered by USDA FSA and has been established to support two main FSA strategic goals centered on agricultural production. These are, increase stewardship of America's natural resources while enhancing the environment, and to ensure commodities are procured and distributed effectively and efficiently to increase food security. The NAIP program supports these goals by acquiring and providing ortho imagery that has been collected during the agricultural growing season in the U.S. The NAIP ortho imagery is tailored to meet FSA requirements and is a fundamental tool used to support FSA farm and conservation programs....
This data set contains imagery from the National Agriculture Imagery Program (NAIP). The NAIP program is administered by USDA FSA and has been established to support two main FSA strategic goals centered on agricultural production. These are, increase stewardship of America's natural resources while enhancing the environment, and to ensure commodities are procured and distributed effectively and efficiently to increase food security. The NAIP program supports these goals by acquiring and providing ortho imagery that has been collected during the agricultural growing season in the U.S. The NAIP ortho imagery is tailored to meet FSA requirements and is a fundamental tool used to support FSA farm and conservation programs....
This data set contains imagery from the National Agriculture Imagery Program (NAIP). The NAIP program is administered by USDA FSA and has been established to support two main FSA strategic goals centered on agricultural production. These are, increase stewardship of America's natural resources while enhancing the environment, and to ensure commodities are procured and distributed effectively and efficiently to increase food security. The NAIP program supports these goals by acquiring and providing ortho imagery that has been collected during the agricultural growing season in the U.S. The NAIP ortho imagery is tailored to meet FSA requirements and is a fundamental tool used to support FSA farm and conservation programs....


    map background search result map search result map Preliminary digital map of cryptocrystalline occurrences in northern Nevada: rkhnd (ArcView shapefile) and rkhnd_crypto (ArcInfo point coverage) FSA 10:1 NAIP Imagery m_4111014_ne_12_h_20150817_20151021 3.75 x 3.75 minute JPEG2000 from The National Map FSA 10:1 NAIP Imagery m_4111014_nw_12_h_20150817_20151021 3.75 x 3.75 minute JPEG2000 from The National Map FSA 10:1 NAIP Imagery m_4111014_se_12_h_20150817_20151021 3.75 x 3.75 minute JPEG2000 from The National Map FSA 10:1 NAIP Imagery m_4111014_sw_12_h_20150817_20151021 3.75 x 3.75 minute JPEG2000 from The National Map USGS 1:24000-scale Quadrangle for Opal, WY 1969 USGS 1:24000-scale Quadrangle for Opal, WY 1969 The chemistry of eolian quartz dust and the origin of chert FSA 10:1 NAIP Imagery m_4111014_ne_12_h_20150817_20151021 3.75 x 3.75 minute JPEG2000 from The National Map FSA 10:1 NAIP Imagery m_4111014_nw_12_h_20150817_20151021 3.75 x 3.75 minute JPEG2000 from The National Map FSA 10:1 NAIP Imagery m_4111014_se_12_h_20150817_20151021 3.75 x 3.75 minute JPEG2000 from The National Map FSA 10:1 NAIP Imagery m_4111014_sw_12_h_20150817_20151021 3.75 x 3.75 minute JPEG2000 from The National Map USGS 1:24000-scale Quadrangle for Opal, WY 1969 USGS 1:24000-scale Quadrangle for Opal, WY 1969 Preliminary digital map of cryptocrystalline occurrences in northern Nevada: rkhnd (ArcView shapefile) and rkhnd_crypto (ArcInfo point coverage) The chemistry of eolian quartz dust and the origin of chert