Bedrock Geology Southwest of Big Salmon Lake, Yukon

A geological report describes lower Paleozoic units southwest of Big Salmon Lake in south-central Yukon. The Government of Yukon published this report, which was last updated on April 17, 2026. It details two contrasting rock units, their composition, ages, and structural features.

Use Cases

• Correlating rock units based on lithological descriptions of dolomitic quartzite, dolostone, and graphitic phyllite.
• Analyzing structural deformation based on descriptions of northwest-trending folds and axial-planar cleavage.
• Studying geological boundaries based on the mention of an interval of metabasaltic schist marking the Askin and Earn group boundary.
• Identifying intrusive rock relationships based on descriptions of crosscutting Devonian–Mississippian gneiss and Cretaceous granite.

Strengths

• Report includes specific geological age indicators, such as Early–Middle Devonian age indicated by two-holed crinoid ossicles.
• Provides detailed lithological descriptions of multiple rock types and metamorphic equivalents.
• Identifies specific geological groups (Askin and Earn groups) for correlation.
• Describes structural features including fold trends and cleavage dip angles.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic bias inherent to the specific surveyed region.

Provenance

Source

Government of Yukon

Time Range

Lower Paleozoic to mid-Cretaceous (based on described rock ages)

Freshness

Last updated 2026-04-17 15:57:53.935257; freshness should be verified.

Geography

Southwest of Big Salmon Lake, parts of NTS 105F/3, 4, 5, 6, south-central Yukon