{"success":{"v":2,"license":"CC-BY 4.0","data":[{"map_id":2922341,"source_id":133,"name":"Silurian System undivided","strat_name":"Sexton Creek Limestone; St. Clair Limestone; Moccasin Springs Formation; Wilhelmi Formation; Elwood Dolomite; Kankakee Dolomite; Joliet Dolomite; Sugar Run Dolomite; Racine Dolomite; Mosalem; Tete des Morts Dolomite; Blanding Dolomite; Sweeney Dolomite; Marcus Dolomite; Racine Dolomite","lith":"Major:{dolostone,limestone}, Minor:{shale}","descrip":"Silurian System undivided, includes Sexton Creek Limestone, St. Clair Limestone, and Moccasin Springs Formation in southern Illinois; includes Wilhelmi Formation, Elwood Dolomite, Kankakee Dolomite, Joliet Dolomite, Sugar Run Dolomite, and Racine Dolomite in northeastern Illinois; includes Mosalem, Tete des Morts, Blanding, Sweeney, Marcus, and Racine Dolomites in northwestern Illinois.","comments":"Thickness from stratigraphic columns (listed from oldest to youngest): Bowling Green Dol (0-50'), Sexton Creek Ls (0-125’), St. Clair Ls (0-150’) (of which the seventy-Six Shale Mbr occurs at the base), Moccasin Springs Fm (0-1,000’) in southern Illinois (south of 40 degrees north latitude); Wilhelmi Fm (0-100’), Elwood Dol (0-30’), Kankakee Dol (0-50’), Joliet Dol (0-80’), Sugar Run Dol (0-30’), and Racine Dol (0-300') in northern Illinois (north of 40 degrees north latitude); Mosalem Fm (0-100’), Tete des Morts Dol (0-24’), Blanding Dol (0-50’), Sweeney Dol (0-55’), Marcus Dol (0-45’), and Racine Dol (0-300’) in northwestern Illinois. The Schweizer Mbr occurs at the base of the Wilhelmi Fm and the Birds Mbr at the top; the Kankakee Dolomite is comprised, from oldest to youngest, of the Drummond, Offerman, Troutman, and Plaines Members; and the Joliet Dolomite is comprised, from oldest to youngest, of the Brandon Bridge, Markgraf, and Romeo Members. Unit name in original GIS (Esri shapefile IL_Geologic_Units_500K_2005_Py) is 'Silurian System'; name on Legend of geologic map is 'Silurian System undivided'. Original map source: Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000.","macro_units":[11581,11585,11950,11953,11958,11959,12266],"strat_names":[2293,3807,3817,3978,7805,7806,63240],"liths":[8,30,31],"t_int_id":107,"t_int_age":419.62,"t_int_name":"Pridoli","b_int_id":111,"b_int_age":443.1,"b_int_name":"Llandovery","color":"#86CDA5","t_age":424.4667,"b_age":445.8333,"best_int_name":"Paleozoic"},{"map_id":951356,"source_id":7,"name":"Silurian sedimentary","strat_name":"","lith":"sedimentary","descrip":"","comments":"","macro_units":[],"strat_names":[],"liths":[111],"t_int_id":105,"t_int_age":419.62,"t_int_name":"Silurian","b_int_id":105,"b_int_age":443.1,"b_int_name":"Silurian","color":"#B3E1B6","t_age":419.2,"b_age":443.8,"best_int_name":"Paleozoic"},{"map_id":3187973,"source_id":154,"name":"Paleozoic sedimentary rocks","strat_name":"","lith":"sedimentary rocks","descrip":"","comments":"","macro_units":[],"strat_names":[],"liths":[111],"t_int_id":74,"t_int_age":251.902,"t_int_name":"Paleozoic","b_int_id":74,"b_int_age":538.8,"b_int_name":"Paleozoic","color":"#99C08D","t_age":251.902,"b_age":541,"best_int_name":null}],"refs":{"7":"Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 . ","133":"Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. ","154":"Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. "}}}