TY - RPRT TI - Bedrock outcrops and areas of thin drift; areas underlain by sedimentary rocks and areas underlain by igneous and metamorphic rocks also shown; Ellington Quadrangle, Connecticut AU - R. B. Colton PY - 1972 DO - 10.3133/ofr7274 UR - https://pubs.usgs.gov/publication/ofr7274 ID - ofr7274 ER -