Sedimentary rocks – mud and sand transformed

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Quartz biotite gneiss specimen from Wonga gold mine.
Image: Jon Augier
Source: Museum Victoria

Schist specimen with sheaves of relict andalusite crystals.
Image: Jon Augier
Source: Museum Victoria

Cambrian

These rocks are among the oldest in Victoria. They began as sediments deposited on the ocean floor. Then they were buried and compressed to form sandstone and mudstone, before being uplifted during periods of mountain-building. Slate and schist formed in regions of higher pressure, and gneiss and granite were formed where the temperatures were hot enough to partly melt the rock. This process is called metamorphosis.

WHERE IT WAS FOUND

Sedimentary rocks map
Ordovician (488 - 433 mya)
Ordovician (488 - 433 mya)
Ordovician metamorphosed
Ordovician transformed by heat and pressure
Cambrian (542 - 488 mya)
Cambrian (542 - 488 mya)

These sedimentary rocks were discovered in Victoria.

RELATED OBJECTS

Other objects from the Cambrian

RedlichiaArchaeocyathidsAnomalocarisWiwaxiaGreenstonesDookie minerals