Bedrock Geologic Map of the Andover Quadrangle, Vermont

Digital Data from VG96-31A Ratcliffe, N.M., 1996,�Digital bedrock geologic map of the Andover quadrangle, Vermont: USGS Open-File Report 96-31-A, 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).

VG96-31A 数字化数据源自N.M. Ratcliffe于1996年完成的《佛蒙特州Andover幅数字化基岩地质图》，收录于美国地质调查局（USGS）公开文件报告96-31-A，包含2幅图件，比例尺为1:24000。该比例尺1:24000的基岩地质图数据，展示了佛蒙特州松散覆盖层下伏基岩的类型。数据通过基于美国地质调查局1:24000比例尺地形底图，采用标准地质步距法、罗盘测量技术及/或全球定位系统（GPS）开展野外填图获取。数据可按城镇、图幅或流域进行组织。每个数据集包可包含点、线、面矢量数据，以及下述部分或全部要素类：1) 接触关系（岩性接触边界）；2) 脆性断裂；3) 韧性断裂；4) 逆冲断层；5) 层面断层（顺层逆冲断层）；6) 层理；7) 粒序层理；8) 倒转层理；9) 出版图件选用的层理测点；10) 面理数据（含foliation_n1、foliation_n2、foliation_n3等）；11) 露头（裸露露头）；12) 野外测点（露头及数据采集点）；13) 褶皱轴；14) 轴面；15) 煌斑岩；16) 水井测井资料（钻井施工方信息）；16) 交汇线理；17) 拉伸线理；18) 剖面线（横截面线）；以及影像线性构造（航空照片识别的线性构造）。每个数据集包还可包含其他要素类。(https://dec.vermont.gov/geological-survey/publication-gis/ofr).