Geology of Peppermint Grove and Cottesloe Beach

Sedimentary sequences formed while sea level rises.

• Transgressive

• Regressive

• Postgressive

• Pregressive

Sedimentary sequences like this can be formed as sea levels fall.

• Postgressive

• Transgressive

• Regressive

• Pregressive

Describe the features of fossiliferous limestone

• Layered

• Friable (breaks easily)

• Fossiliferous (contains fossils) and contains shells

• Sandy or clastic

There are four distinct sequences of deposition in Perth cliff faces. They range from deep marine, to shallow marine, to beach zones, to land. What features are present in 1: Deep Ocean?

• Clearly rippled

• Larger layers, curves, and trought

• Cross-bedding

• Rhizoliths

There are four distinct sequences of deposition in Perth cliff faces. They range from deep marine, to shallow marine, to beach zones, to land. What features are present in 2: Shallow Marine?

• Larger layers, curves, and troughs.

• Planar-bedding

• Clearly rippled

• Cross-bedded

There are four distinct sequences of deposition in Perth cliff faces. They range from deep marine, to shallow marine, to beach zones, to land. What features are present in 3: Beach Zone?

• Lightly rippled

• Planar-bedded

• Flat layers

• Phizoliths

There are four distinct sequences of deposition in Perth cliff faces. They range from deep marine, to shallow marine, to beach zones, to land. What features are present in 4: Land?

• Little layering or structure

• Clearly rippled

• Aeolian

• Rhizoliths

Point of deposition for 4: Land?

• Underwater (near shore) - rippling due to waves near shore

• Open air - large scale cross beds relate to sand dunes

• Transition to marine - flat deposition in swash zone

• Underwater - troughs suggest flow channel and accumulation of marine fossils indicates river or sea floor

Point of deposition for 3: Beach Zone?

• Underwater - troughs suggest channel flow

• Open air - large scale cross beds relate to sand dune

• Transition to marine - flat deposition on swash zone

• Underwater (near shore) - rippling due to waves near shore

Point of deposition of 2: Shallow Marine?

• Open air - large scale cross beds relate to sand dunes

• Transition to marine - flat deposition in swash zone

• Underwater - troughs suggest channel flow and accumulation of marine fossils indicates river or sea floor

• Underwater (near shore) - rippling due to waves near shore