{"success":{"v":2,"license":"CC-BY 4.0","data":[{"map_id":2981592,"source_id":133,"name":"Franciscan melange","strat_name":"Franciscan Complex","lith":"Major:{melange}","descrip":"Melange of fragmented and sheared Franciscan complex rocks.","comments":"Coast Ranges. Includes areas of Franciscan rocks specifically distinguished as melange on the Geologic Map of California. Includes parts of central and eastern Franciscan belts of Blake et al. (1988) Original map source: Saucedo, G.J., Bedford, D.R., Raines, G.L., Miller, R.J., and Wentworth, C.M., 2000, GIS Data for the Geologic Map of California, California Department of Conservation, Division of Mines and Geology, CD-ROM 2000-07, scale 1:750,000. Primary reference: Jennings, C.W., with modifications by Gutierrez, C., Bryant, W., Saucedo, G., and Wills, C., 2010, Geologic map of California, Version 2.0 (California Geological Survey 150th Anniversary Edition), Department of Conservation, California Geological Survey: California Geologic Data Map Series, GDM No. 2, scale 1:750,000.","macro_units":[17639],"strat_names":[76217],"liths":[],"t_int_id":33,"t_int_age":66,"t_int_name":"Cretaceous","b_int_id":48,"b_int_age":201.4,"b_int_name":"Jurassic","color":"#5ABC8C","t_age":139.8,"b_age":150.325,"best_int_name":"Mesozoic"},{"map_id":3190324,"source_id":154,"name":"Mesozoic tectonic rocks","strat_name":"Franciscan Complex","lith":"shale","descrip":"","comments":"metamorphic protolith: mafic volcanics","macro_units":[],"strat_names":[76217],"liths":[8],"t_int_id":33,"t_int_age":66,"t_int_name":"Cretaceous","b_int_id":48,"b_int_age":201.4,"b_int_name":"Jurassic","color":"#5ABC8C","t_age":66,"b_age":201.3,"best_int_name":"Mesozoic"},{"map_id":2597695,"source_id":93,"name":"Central Belt of the Franciscan Complex, graywacke and mélange","strat_name":"Franciscan Complex","lith":"","descrip":"Massive to distinctly bedded, brown-, orange-, and white-weathering, green to gray, lithic wacke and dark-gray or black siltstone, shale, and slate, grading into mélange consisting of sheared argillite and graywacke matrix enclosing blocks and lenses of sedimentary, metamorphic, and volcanic rocks. Because contacts between coherent graywacke and mélange are gradational (derived from different amounts of shearing) and because of the size and amount of cover in the map area, it was not possible in this study to differentiate everywhere between coherent graywacke and mélange. Where observed, coherent graywacke masses within the unit are indicated on source map by a green hachure, while large observed blocks that are too small to map at 1:100,000 scale are indicated by diamonds (high-grade) and triangles (low-grade), and structural bodies known to be comprised primarily of mélange are mapped separately (fsr). Coherent graywacke bodies also locally include conglomerate, pebbly sandstone, and rare thin beds of red and white chert. Coarse clasts include black chert, quartzite, hornfels, granite, rhyolite, lithic wacke, blueschist, greenstone, green chert, marble, amphibolite, and quartz-mica schist. In many places, the graywacke contains conspicuous large chips of black and green shale. Coherent sedimentary rocks range from completely unfoliated to moderately foliated (Textural Zones 1-2A of Jayko and others, 1986). Late Jurassic (Tithonian) fossils have been found in both the coherent graywacke and the mélange matrix (Bailey and others, 1964; D.L. Jones, written commun.). Interbedded chert from the Asti quadrangle has been sampled, but not yet processed for microfossils. Interbedded chert in similar coherent graywacke in Marin County has yielded Late Jurassic to Early Cretaceous microfossils (Murchey and Jones, 1984). Chert pebbles from conglomerate have yielded Late Triassic to Early Jurassic microfossils (Seiders and Blome, 1984). Graywacke in this unit is distinguished from most other Franciscan Complex graywacke by its high lithic content. It is similar in composition to sandstone in Central Belt of Franciscan Complex (Kfgwy) but is significantly older, is in places more foliated, and lacks the depositionally underlying sequence of chert (KJfc) and greenstone (Jfgs)","comments":"","macro_units":[17639],"strat_names":[76217],"liths":[8,9,10,12,14,45,53,63,64,78,82,84,85,86,87,89,90,91,111,176],"t_int_id":33,"t_int_age":66,"t_int_name":"Cretaceous","b_int_id":48,"b_int_age":201.4,"b_int_name":"Jurassic","color":"#5ABC8C","t_age":139.8,"b_age":150.325,"best_int_name":"Mesozoic"},{"map_id":971226,"source_id":7,"name":"Cretaceous-Tertiary sedimentary","strat_name":"","lith":"sedimentary","descrip":"","comments":"","macro_units":[],"strat_names":[],"liths":[111],"t_int_id":474,"t_int_age":2.58,"t_int_name":"Tertiary","b_int_id":33,"b_int_age":143.1,"b_int_name":"Cretaceous","color":"#9AD9DD","t_age":2.588,"b_age":145,"best_int_name":"Phanerozoic"}],"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 . ","93":"Blake, M.C. Jr., R.W. Graymer, R.E. Stamski. Geologic Map and Map Database of Western Sonoma, Northernmost Marin, and Southernmost Mendocino Counties, California. U.S. Geological Survey Miscellaneous Field Studies Map MF-2402. ","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. "}}}