Meters 0 -1000 - 2000 Co Br Asc As Gg Gr Co 1 Km (Cobalt) Quartzite, quartz conglomerate, limestone, siltstone. (Bruce) Quartzite, conglomerate, limestone, siltstone, arkose sandstone. Schist derived from basalt; locally contains iron-rich chert. Graywacke sandstone, locally altered to mica schist. Granite gneiss. Granite. All of the rocks are Proterozoic in age. Redrawn from the Blind River Map, Geologic Survey of Canada, 1925. Asc As
Figure 7.16 Geologic cross section of the Algoma Mining District, Canadian Shield. This district is just north of the international boundary, about 480 km directly north of Detroit, Michigan.
Based on the accompanying figure, answer each of the following statements as probable [P] or not probable [NP].
Asc and As are not necessarily the same age, but both are younger than Br. ["", ""]
Granite gneiss Gg is older than sediments Br. ["", ""]
Granite Gr is younger than granite Gg, and perhaps younger than sediments Br. ["", "", "", ""]
The last period of folding in the region was after the deposition of Co. ["", ""]
A very long period of erosion intervened between the deposition of Asc and Br. ["", ""]
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