Filters: partyWithName: Gregory J Walsh (X)
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This collection contains unpublished hand drawn geologic maps, field maps, traverse maps, sample location maps, and cross sections of Traveler Mountain and vicinity, central Maine. The maps were created by Douglas W. Rankin between 1955 and 1961 (date is indicated if known) and scanned in 2016. Most maps use a 7.5-minute topographic quadrangle as a base. Some compiled maps of larger areas are a composite of several 7.5-minute quadrangle maps and latitude and longitude values are indicated on the map. Please contact the Eastern Geology and Paleoclimate Science Center for additional information and access to original copies.
Abandoned railroads and infrastructure from the anthracite coal mining industry are significant features in abandoned mine lands and are an important part of history; however, these features are often lost and masked by the passage of time and the regrowth of forests. The application of modern light detection and ranging (lidar) topographic analysis, combined with ground-truthing "boots on the ground" mapping, enable recovery of the location of these historical features. Waste rock piles and abandoned mine lands from historical mining locally appear as distinct features on the landscape depicted on the percent slope map. Abandoned, and in many places demolished, infrastructure such as breakers, turntables, rail...
Magnetic susceptibility was measured on outcropping rock in the eastern Adirondack Mountains, New York. A Terraplus KT-20 was used for the measurements. The corresponding rock type was identified using standard field geologic approaches. Locations of the outcrops were determined using a handheld GPS.
Categories: Data;
Tags: Adirondack,
Essex County,
New York,
geoscientificInformation,
magnetic susceptibility
The bedrock geologic map database of the Woodstock quadrangle consists of highly deformed metasedimentary rocks of the Central Maine trough, including the Silurian Rangeley and Perry Mountain Formations and the Devonian Littleton Formation. The central, northern, and eastern parts of the quadrangle are underlain by the oldest rocks in the area, the Rangeley Formation. In the southwest and southcentral part of the quadrangle, metaturbidites of the Perry Mountain Formation and subsequent Littleton Formation overly the Rangeley Formation in a deformed F1 synform, herein informally called the Bagley Brook basin. The metasedimentary rocks were intruded by widespread syn- to post-tectonic granitoids of the Devonian New...
The refractory nature of zircon to temperature and pressure allows even a single zircon grain to preserve a rich history of magmatic, metamorphic, and hydrothermal processes. Isotopic dating of micro-domains exposed in cross-sections of zircon grains allows us to interrogate this history. Unfortunately, our ability to select the zircon grains in a heavy mineral concentrate that records the most geochronologic information is limited by our inability to predict internal zonation from observations of whole zircon grains. Here we document the use of a petrographic microscope to observe and image the photoluminescence (PL) response of whole zircon grains excited under ultraviolet (UV) light, and the utility of this PL...
Categories: Data;
Tags: Adirondacks, NY,
Beauty Spot, NC,
Geochemistry,
Geochronology,
Sussex County, VA,
Thirty-four ore, twenty-nine mine waste, seven host rock, two pegmatite, and one slag sample were collected from iron oxide-apatite (IOA) mines in the eastern Adirondack Highlands near Mineville and Ticonderoga, New York, from March 2016 to August 2018. The waste pile samples included twenty-five samples collected from rubble-sized mine waste piles and four samples from processed tailings piles. The ore from historic iron mines of the eastern Adirondack Highlands, New York, contain abundant quantities of rare earth element (REE)-bearing apatite crystals. These apatite crystals are especially enriched in Y, La, Ce, and Nd. In-ground ore, mine waste piles, and tailings piles could contain apatite...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Adirondack Mountains,
Energy Resources,
Geochemistry,
ICP-MS,
ICP-OES,
Iron oxide-apatite (IOA) deposits of the Adirondack Mountains of New York locally contain elevated REE concentrations (e.g. Taylor and others, 2019). Critical to evaluating resource potential is understanding the genesis of the IOA deposits that host the REE-rich minerals. As part of this effort, the U.S. Geological Survey (USGS) is conducting bedrock geologic mapping, geochronology, geochemistry, and geophysics in the region. Published and ongoing research demonstrates the spatial association of IOA deposits with the Lyon Mountain Granite Gneiss (LMG), so understanding the relationship of the LMG to the IOA deposits is important for resource evaluation—however the age and origin of the LMG remain contentious. As...
Categories: Data,
Data Release - Revised;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Adirondack Mountains,
Dannemora,
Hawkeye,
Keene,
Lyon Mountain,
This data release includes whole rock (WR) geochemical data for 94 samples. Whole rock geochemistry data were analyzed at Actlabs in Ancaster, Ontario, Canada. Rock samples were collected by Peter Valley, Greg Walsh, Arthur Merschat, and Ryan McAleer. The whole rock geochemistry data characterize the composition of mapped meta-igneous rocks in eastern Vermont and western New Hampshire, USA. The data release contains three files, including one metadata file and 2 comma-delimited (CSV) files. The CSV files include the following: BronsonHill_WR_data.csv and BronsonHill_WR_data_dictionary.csv.
Categories: Data;
Tags: Bronson Hill arc,
Connecticut Valley - Gaspé trough,
FBGC,
Florence Bascom Geoscience Center,
Geochemistry,
This data release provides a generalized lithology look-up table for the lithogeochemical classification of Vermont's bedrock geologic map units. The table is defined from the mapped bedrock geologic units published by Ratcliffe and others (2011) and the generalized lithology of rock group A and rock group B for lithogeochemical classification as defined by Robinson and Kapo (2003). The 2003 classification was created for all six New England states and Vermont's geologic units were based on an older, less detailed, bedrock map of Vermont by Doll and others (1961). The new data table in this data release is designed to be joined with the published attribute table from the 2011 map database, as part of the bedrock...
Radiometric (gamma spectrometry) measurements were made on outcropping rock and during walking surveys in the eastern Adirondack Highlands, New York using a GF Instruments Gamma Surveyor. Outcrop measurements were made over 2-minute intervals directly on rock. Walking surveys involved recording measurement averages over 30-second intervals while holding the instrument approximately 1 meter above the ground. Locations were obtained via a handheld GPS. For the outcrop measurements, rock types were identified using standard field methods. Walking surveys were conducted near magnetite-apatite deposits and in areas with mine tailings. For more information on radiometric methods, please see the International Atomic Energy...
Categories: Data;
Tags: Adirondack,
Essex County,
New York,
gamma spectrometry,
geoscientificInformation,
This data release includes whole rock (WR) geochemical data, and uranium-lead isotopic data collected using a sensitive high resolution ion microprobe-reverse geometry (SHRIMP-RG) instrument; the SHRIMP-RG is a type of secondary ion mass spectrometer (SIMS). Whole rock geochemistry data were analyzed at Bureau Veritas Commodities Canada Ltd. Laboratories in Vancouver, British Columbia, Canada. SHRIMP-RG data were collected at the USGS-Stanford University SHRIMP-RG in Palo Alto, California, USA. Rock samples for all methods were collected by Phillip Geer, Sean Regan, and Greg Walsh. SHRIMP-RG sample preparation and analyses were conducted by Ryan McAleer. The whole rock geochemistry and uranium-lead (U-Pb) isotopic...
Petrophysical data were collected in the eastern Adirondack Highlands during several field campaigns in 2016-2017. This data release provides magnetic susceptibility, gamma spectrometry, and density measurements on rock outcrops, hand samples, and during walking surveys. Rock types for the outcrops and samples were identified using standard field methods. Locations of the outcrops or samples were determined using a handheld GPS.
This collection contains unpublished hand drawn geologic maps, field maps, traverse maps, sample location maps, and cross sections of the area around Littleton, New Hampshire and adjacent Vermont. The maps were created by Douglas W. Rankin between 1992 and 2014 (date is indicated if known) and were scanned in 2016. Most maps use a 7.5-minute topographic quadrangle as a base. Some compiled maps of larger areas are a composite of several 7.5-minute quadrangle maps and latitude and longitude values are indicated on the map. Please contact the Eastern Geology and Paleoclimate Science Center for additional information and access to original copies.
The density of rock samples collected 2016-2017 from the eastern Adirondack Highlands in New York was measured in the laboratory using standard immersion methods. The corresponding rock type was identified using standard field geologic approaches. Rock locations were determined in the field using a handheld GPS.
This data release consists of information from published tables in Connecticut Water Resources Bulletins (WRBs) transcribed into tabular digital format. Information about wells and test holes in the WRBs used in this data release consists of geographic location, depth to consolidated rock (bedrock depth), and depth of the well or test hole. The WRBs, published between 1966 and 1980 by the U.S. Geological Survey (USGS) in cooperation with either the Connecticut Water Resources Commission or the Connecticut Department of Environmental Protection, provided the foundational datasets for companion interpretive USGS Water-Resources Investigation Reports. NOTE: Version 2.0 adds 196 records but is otherwise identical to...
Categories: Data,
Data Release - Revised;
Tags: Connecticut,
USGS Science Data Catalog (SDC),
bedrock surface,
borehole logging,
lithology
This dataset accompanies planned publication 'Unmixing multiple metamorphic muscovite age populations with powder X-ray diffraction and 40Ar/39Ar analysis'. The 40Ar/39Ar and electron microprobe data are from samples adjacent to a lower greenschist facies shear zone in western New Hampshire. The geochronology coupled with the electron microprobe data provide a petrochronologic framework for the rocks studied in the manuscript. Sample collection was supervised by Ryan McAleer, Gregory Walsh, and Peter Valley of the USGS.
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 40Ar/39Ar,
Claremont, New Hampshire,
FBGC,
Florence Bascom Geoscience Center,
NCGMP,
This data release includes fracture orientation measurements and outcrop photographs collected at new road cuts along New Hampshire Route 111 in June 2014. Road cuts along the New Hampshire State Route 111 bypass in Windham, New Hampshire expose the metasedimentary Silurian Berwick Formation intruded by multiple phases of foliated to non-foliated granite to granitic pegmatite of the Devonian New Hampshire Plutonic Suite. Fracture characterization at two road cuts (localities 1 and 2) included measurement of fractures over a distance of approximately 225 m and 85 m, respectively. The data release contains two spreadsheets in comma-delimited (CSV) format, 22 photographs in JPEG format, plus a metadata file. The CSV...
Categories: Data;
Tags: FBGC,
Florence Bascom Geoscience Center,
Fractured bedrock,
Hydrology,
NGCMP,
In response to Executive Order 13817 of December 20, 2017, the U.S. Geological Survey (USGS) coordinated with the Bureau of Land Management (BLM) to identify 35 nonfuel minerals or mineral materials considered critical to the economic and national security of the United States (U.S.). Acquiring information on possible domestic sources of these critical minerals is the basis of the USGS Earth Mapping Resources Initiative (Earth MRI). The program, which partners the USGS with State Geological Surveys, federal agencies, and the private sector, aims to collect new geological, geophysical, and topographic (lidar) data in key areas of the U.S. to stimulate mineral exploration and production of critical minerals. The first...
Categories: Data;
Types: ArcGIS REST Map Service,
ArcGIS Service Definition,
Downloadable,
Map Service;
Tags: Alabama,
Alaska,
Arizona,
Arkansas,
California,
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