Bedrock geology index map

The Bedrock Index provides a spatial record of the location of all Bedrock maps published by the Geological Survey of Canada and hosted on Geoscan. The index has three "series" of maps; CGM, A series, and preliminary maps. In cases where there have been multiple editions of a map, the most recent record is reported in the Bedrock Index attribute table. Maps published in Open File documents are not recorded in the bedrock index.

The "A" series maps were produced from 1909 to 2010 and have been replaced by the CGM (Canadian Geoscience Maps) series. CGM maps began production in 2010 and are still being published. Preliminary maps were published from 1941 to 2021.

Data and Resources

Additional Info

Field	Value
Last Updated	April 17, 2026, 18:58 (UTC)
Created	April 17, 2026, 18:58 (UTC)
contact_email	nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca
contact_person	{"fr": "Gouvernement du Canada; Ressources naturelles Canada; Commission géologique du Canada,nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca", "en": "Government of Canada; Natural Resources Canada; Geological Survey of Canada,nrcan.gsc-geosciencedata-donneesgeoscience-cgc.rncan@canada.ca"}
criticality_level	[]
data_dictionary	EPSG:3979,http://www.epsg-registry.org/,6.14
geographic_scope	[]
open_canada_collection	fgp
open_canada_date_published	2024-02-23 00:00:00
open_canada_keywords	{"fr": ["Géologie de la roche en place", "Carte de série \"A\"", "socle", "croûte continentale", "faille", "roche ignée", "manteau", "couverture sédimentaire", "roche volcanique", "Sciences de la terre", "Carte géologique", "Géologie", "Roche dure", "Roche ignée", "Roche métamorphique", "Roche sédimentaire", "Tectonique"], "en": ["Bedrock Geology", "\"A\" Series Map", "basement", "continental crust", "fault", "igneous rock", "mantle", "sediment cover", "volcanic rock", "Earth sciences", "Geological maps", "Geology", "Hard rocks", "Igneous rocks", "Metamorphic rocks", "Sedimentary rocks", "Structural geology"]}
open_canada_subject	["form_descriptors", "nature_and_environment", "science_and_technology"]
sensitivity_level	unrestricted
title_fr	Carte d'index de la géologie du socle rocheux
update_frequency	P6M