precambrian in a sentence

Examples

1. Precambrian rock is the major component of the bedrock.
2. Beneath the glacial till lies Cambrian and Precambrian bedrock.
3. The side of the pit consists of Precambrian gabbro.
4. The intrusive rocks ( late Precambrian ) are in part covered by sand.
5. SRC also mapped the groundwater resources in Saskatchewan south of the Precambrian Shield.
6. The rocks range in age from Precambrian to Miocene.
7. Surely these are the Ediacaran biota from the Earth in the late Precambrian?
8. The only Precambrian rock unit is the Baltimore Gneiss.
9. The uranium occurs as pitchblende in a hydrothermal vein deposit in Precambrian granite.
10. The oldest Precambrian rocks are the Ulverstone Metamorphic Complex and Forth Metamorphic Complex.