Gamma ray spectrometry measurements of Ordovician strata at Tumbling Run, Virginia

This dataset includes gamma ray spectrometry measurements from exposed Ordovician mixed carbonate and siliciclastic strata near Tumbling Run, Virginia; a regionally recognized reference section within the central Appalachians. Gamma ray measurements were collected on a continuous assay with a thirty second collection interval by walking one meter from the outcrop face using a GF Instruments Gamma Surveyor Vario handheld gamma-ray spectrometer. The measurements were collected to characterize the radiometric signature of the ~860 feet of outcropping stratigraphy of the Pinesburg Station Dolomite of the Beekmantown Group, New Market Limestone, Lincolnshire Limestone, Edinburg Formation, and the Stickley Run Member of the Martinsburg Formation at this location. These data will also serve as ground truth measurements for published and ongoing airborne radiometric surveys within the region.

本数据集包含弗吉尼亚州坦布林润（Tumbling Run）附近出露的奥陶系（Ordovician）混合碳酸盐岩（carbonate）与硅质碎屑岩（siliciclastic）地层的伽马射线能谱（gamma ray spectrometry）测量数据，该区域为阿巴拉契亚山脉中部（central Appalachians）一处区域公认的标准剖面。本次伽马射线测量采用GF Instruments品牌的Gamma Surveyor Vario手持式伽马射线能谱仪（handheld gamma-ray spectrometer），沿露头面每隔1米采集一组数据，单次采集时长为30秒，实现连续采样。本次测量旨在表征该地点出露的约860英尺地层的放射性特征，上述地层包括比克曼顿群（Beekmantown Group）的平斯堡站白云岩（Pinesburg Station Dolomite）、新市场灰岩（New Market Limestone）、林肯郡灰岩（Lincolnshire Limestone）、爱丁堡组（Edinburg Formation）以及马丁斯堡组（Martinsburg Formation）的斯蒂克利润段（Stickley Run Member）。这些数据还可作为该区域已发表及正在开展的航空放射性调查的地面真值（ground truth）实测资料。