Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5443
EASTING 575686 NORTHING 6058921 ZONE 14 DATUM NAD83
Date of mapping 06/21/1984

STRUCTURAL DATA

Layering:
Layering type | Strike | Dip | top Direction
bedding | 241 | 87 | S

-north edge and west end of reef is siltstone, rest meta-gabbro

PETROLOGIC DATA

Rock Number: 1

Rock Type: siltstone
Descriptors:
laminated
silicic compostion
Field Description:

-beige weathering, black vitreous on fresh surface
-finely laminated with delicate grading and rippled
-looks very siliceous, but this may just be contact effect of (Molson) causing silicification
-looks like cherty siltstone unit on Lunch Island at entrance to Pipestone Lake

Rock Number: 2

Rock Type: gabbro
Descriptors:
ophitic texture
melanocratic
Field Description:

-appears to be large coarse gabbro segment of Molson Dike
-no tectonic fabric except for some minor shearing and quartz veining
-cut by younger age of fine grained Molson Diabase (sample B) (sampled in 88)

Manitoba Geological Survey, 2017