{"source_id":"bgs-geology-guinea","source_url":"https://africagroundwateratlas.org/downloads/Guinea.zip","upstream_zip_sha256":"0a3aa292043a6515bee6b9f82bea6186d9e2627a82b83efd4cf90835ad48e94e","consulted":"2026-10-01","edition":"2019/2021 · version 1.0","geological_base_year":2002,"scale":5000000,"crs":"EPSG:4326","license":"CC BY-SA 4.0","license_url":"https://creativecommons.org/licenses/by-sa/4.0/","record_count":260,"units":[{"id":"basement","name":"Socle métamorphique","source_label":"Archaean-Lower Proterozoic metamorphic","color":"#ba91bf","age":"Archéen – Protérozoïque inférieur","note":"Gneiss, schistes, quartzites et amphibolites du socle. La formation ne prouve pas la présence d’un gisement."},{"id":"cambrian","name":"Sédiments du Cambrien","source_label":"Cambrian sedimentary","color":"#d3c884","age":"Cambrien","note":"Grès et conglomérats. Carte de reconnaissance à l’échelle nationale."},{"id":"devonian","name":"Sédiments du Dévonien","source_label":"Devonian sedimentary","color":"#87bcae","age":"Dévonien","note":"Pélites et siltites, notamment de la série de Faro."},{"id":"igneous","name":"Intrusions magmatiques","source_label":"Mesozoic igneous","color":"#b88b78","age":"Mésozoïque","note":"Sills, dykes et autres intrusions. Dolérite et roches magmatiques associées."},{"id":"ordovician","name":"Grès de l’Ordovicien","source_label":"Ordovician sedimentary","color":"#ddb48b","age":"Ordovicien","note":"Grès de la série de Pita, avec des quartzites."},{"id":"recent-sediments","name":"Sédiments côtiers et alluviaux","source_label":"Quaternary to Upper Cretaceous sedimentary","color":"#bad5a1","age":"Crétacé supérieur – Quaternaire","note":"Sédiments meubles côtiers et alluviaux. La carte généralise fortement les petites unités."},{"id":"silurian","name":"Sédiments du Silurien","source_label":"Silurian sedimentary","color":"#95b2c5","age":"Silurien","note":"Pélites et siltites de la série de Télimélé."},{"id":"proterozoic","name":"Métasédiments du Protérozoïque","source_label":"Upper Proterozoic dominantly metasedimentary","color":"#c9ac72","age":"Protérozoïque supérieur","note":"Ensembles majoritairement métasédimentaires, dont quartzites et grès arkosiques."}],"note":"Reconnaissance géologique à 1:5 000 000, antérieure à 2026. Ni carte de réserves ni modèle du sous-sol en profondeur. Les limites côtières peuvent différer du fond administratif. Géométrie fortement généralisée à conserver à l’échelle nationale.","files":{"Guinea_HG.shp":{"bytes":763228,"sha256":"a61afc3315c2d4ec4e1958189fbdfa5bec70f286fa646d3743a5ef9c9bf5fdc6"},"Guinea_HG.dbf":{"bytes":30258,"sha256":"630b6265196b549bd2a022b20b69ad104483187d2954b28642807e2df6f7cbf0"},"Guinea_HG.prj":{"bytes":219,"sha256":"514d90b133d45328d2d8a70e74c01e5cddc18196b90fff7cf818f0f381a11673"},"Guinea_HG.cpg":{"bytes":5,"sha256":"3ad3031f5503a4404af825262ee8232cc04d4ea6683d42c5dd0a2f2a27ac9824"}},"repairs":[{"record":15,"reason":"Ring Self-intersection[-11.5164461660577 12.0114957013656]","area_change_ratio":1.7300102542157392e-15,"method":"GEOS make_valid structure, collapsed rings removed"},{"record":194,"reason":"Ring Self-intersection[-8.60806686909069 8.19637203674017]","area_change_ratio":3.2737907804423013e-16,"method":"GEOS make_valid structure, collapsed rings removed"}]}