Second lot of sample + Background information on geology

Today the second lot of samples were taken. These include 3 water and soil samples taken from 3 different areas of the pond. This lot of samples was taken in fine conditions with no rainfall present in the two days before.

Background info on geology: http://www.centennialparklands.com.au/

• Bands and lenses of Waverley Coffee Rock, a finely textured soft impermeable mudstone occur at numerous locations in the lower lying sections of the Parklands. The resultant podsolised soil profiles are azonal, acidic and with only weakly differentiated or non existent horizon development.

• The Botany Sands overlay the northern edge of the Botany Basin and are composed of a complex of Aeolian sand dunes of the Holocene era, of variable thickness, with an underlying layer of inter-bedded clays, peats and sands. This material resulted in a natural landform of rounded sand dunes and expanses of gentle slopes with local depressions and exposed water tables (ponds and marshes)

• The original soil type for the Centennial Parklands is a white crystalline wind-blown sand of the Holocene era, overlying Hawkesbury Sandstone which outcrops at the northern edge of Centennial Park before dipping to depths of between eight to two hundred and fifty meters south towards Botany Bay. 

 unidentified rocks on the bank of the pond