I know you can find them in the layers on I mapBC

Go to Data sources, then add provincial layers and then they are under geology and soils

Hope that helps!! IF not good enough then you can build it in QGIS as well

iMapBC - Province of British Columbia

I don’t know if it would work with your ARIS assessment but I like to use Macrostrat

I like to use the BC Digital geology dataset in QGIS personally, but you can also view it as a layer and export maps in MapPlace 2 or iMapBC. Regardless of how you access it, this is generally the most up-to-date regional geology data (although for some areas there's better mapsheet-scale stuff).

BC Digital Geology dataset as Lindsey Richards mentions above (I use QGIS). Then, use "Group Suite Name" +/ "Rock Type". I prefer to decrease opacity on a regional geology map to show some of the features underneath (topo lines, drainages, etc).