Bedrock Geologic Map of the Chester Quadrangle, Vermont

Digital Data from VG95-576A Ratcliffe, N.M., 1995,�Digital bedrock geologic map of the Chester quadrangle, Vermont: USGS Open-File Report 95-576, 2 plates, scale 1:24000. The bedrock geologic map data at a scale of 1:24,000 depicts types of bedrock underlying unconsolidated materials in Vermont. Data is created by mapping on the ground using standard geologic pace and compass techniques and/or GPS on a USGS 1:24000 topographic base map. Data may be organized by town, quadrangle or watershed. Each data bundle may includes point, line and polygon data and some or all of the following: 1) contacts (lithogic contacts), 2) fault_brittle, 3) fault_ductile, 4) fault_thrust, 5) fault_bed_plane (bedding plane thrust), 6) bedding, 7) bedding_graded (graded bedding) 8) bedding_overturn (overturned bedding), 9) bedding_select (selected points for published map), 10) foliation_n1, n2, n3 etc (foliation data), 11) outcrop (exposed outcrops), 12) field_station (outcrop and data collection point), 13) fold_axis, 14) axial_plane, 15) lamprophyre, 16) water_well_log (water well driller information), 16) linear_int (intersection lineation), 17) linear_str (stretching lineation) 18) x_section_line (line of cross-section), and photolinear (lineaments identified from air photos). Other feature classes may be included with each data bundle. (https://dec.vermont.gov/geological-survey/publication-gis/ofr).

VG95-576A号数据集源自Ratcliffe, N.M.于1995年编制的《佛蒙特州切斯特幅基岩地质数字图》，相关成果收录于美国地质调查局（USGS）《公开文件报告95-576号》，共计2幅印刷图件，比例尺为1:24000。本套1:24000比例尺的基岩地质图数据，展示了佛蒙特州松散覆盖层之下的基岩类型。该数据通过地面填图方式生成：采用标准地质步测与罗盘测量技术，或借助全球定位系统（GPS），以美国地质调查局1:24000比例尺地形底图作为工作底图开展测绘。数据可按城镇、图幅或流域进行分类组织。每个数据包可涵盖点、线、面三类矢量数据，以及下述部分或全部要素类：1) 岩性接触界线（岩性接触面）；2) 脆性断裂；3) 韧性断裂；4) 逆冲断层；5) 层理面断层（层理面逆冲构造）；6) 层理；7) 粒序层理；8) 倒转层理；9) 选定点层理（公开图件使用的选定点）；10) 叶理n1、n2、n3等（叶理数据）；11) 露头（裸露露头）；12) 野外测点（露头与数据采集点）；13) 褶皱轴；14) 轴面；15) 煌斑岩；16) 水井测井记录（钻井施工信息）；16) 交切线理（面交切形成的线理）；17) 拉伸线理；18) 剖面线（地质剖面线）；以及航片线性构造（航空影像解译识别的线性构造）。每个数据包还可包含其他额外要素类。（数据来源：https://dec.vermont.gov/geological-survey/publication-gis/ofr）