Geologic map and database of the Roseburg 30 x 60 minute quadrangle, Douglas and Coos Counties, Oregon

This digital map database, largely compiled from new mapping by
the authors, represents the general distribution of bedrock and
surficial deposits of the Roseburg 30 x 60 minute quadrangle
along the southeastern margin of the Oregon Coast Range and its
tectonic boundary with Mesozoic terranes of the Klamath
Mountains. Together with the accompanying text files as PDF
(rb_geol.pdf), it provides current information on the geologic
structure and stratigraphy of the area covered. The database
delineates map units that are identified by general age and
lithology following the stratigraphic nomenclature of the U.S.
Geological Survey. The scale of the source maps is 1:24,000, but
the Quaternary contacts and structural data have been much
simplified for the 1:100,000-scale map and database. The spatial
resolution (scale) of the database is 1:100,000 or smaller.

本数字地图数据库主要由作者团队通过最新野外测绘工作整编完成，系统呈现了俄勒冈海岸山脉东南缘及该区域与克拉马斯山脉中生代地体的构造边界范围内，罗斯堡30×60分幅图幅的基岩与表层沉积物总体分布特征。随库附带的PDF格式文档（rb_geol.pdf），可为覆盖区域的地质构造与地层学研究提供最新权威资料。该数据库遵循美国地质调查局（U.S. Geological Survey）的地层命名规范，依据大致年代与岩性对地图制图单元进行界定与标识。原始源地图比例尺为1:24,000，但针对本1:100,000比例尺的地图及数据库，第四纪接触关系与构造数据已做大幅简化处理。本数据库的空间分辨率（比例尺）为1:100,000或更小比例尺。