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Alamagan Volcano - geochronologic points Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamagan Island, Andesite, GeochronPoints, Intermediate volcanic rock, Lava flow, All tags... Northern Islands, Northern Mariana Islands, Pacific, Pacific Islands, Pyroclastic rock, United States, Volcanic rock, geochronologic point, geologic maps, radiocarbon, radiocarbon point, radiocarbon sample, volcanic activity, Fewer tags Soil Biogeochemical Data from a Marine Terrace Soil Climo-Chronosequence Comparison The storage and persistence of soil organic matter (SOM) is of critical importance to soil health, and to the terrestrial carbon cycle with implications for long-term climate change. To better understand the spatio-temporal controls on SOM, we have developed a new dataset spanning two previously described marine terrace soil chronosequences from northern, CA, USA: the Santa Cruz and the Mattole River chronosequences. Each of these sites, is comprised of several terraces surfaces that span at least 200 ka of soil development. The sites differ with regard to local precipitation, with the Mattole site receiving nearly double the mean annual precipitation of the Santa Cruz site. During the period from 2011 through 2016,... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: California, Geochemistry, Land Use Change, Land Use Change, Petrolia, All tags... Santa Cruz, Soil Sciences, Soil Sciences, USGS Science Data Catalog (SDC), carbon, elemental chemistry, geoscientificInformation, mineralogy, radiocarbon, soil, surface area, Fewer tags Isotopic, geochronologic and soil temperature data for Holocene and late Pleistocene soil carbonates of the San Luis Valley, Colorado and New Mexico, USA This data release contains radiocarbon dates and clumped isotope ratios for soil carbonates as well as observed soil temperatures for study sites in the San Luis Valley, Colorado and New Mexico, USA. The companion publication can be found at https://doi.org/10.1029/2023GC011221. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Colorado, Geochemistry, Hydrology, Land Use Change, New Mexico, All tags... San Luis Valley, Soil Sciences, USGS Science Data Catalog (SDC), biota, clumped isotopes, radiocarbon, soil carbonate, soil temperature, Fewer tags