Sunday, November 22, 2009
Tuesday, November 17, 2009
Paddling out into the Tasman Sea between the North and South headlands it is curious to imagine that about 10,000 years ago it was not possible to do this from the southern side of Port Jackson.
According to C.F Laseron (1954), in the last post-glacial period South Head was contiguous with Middle Head, forcing the Parramatta River to empty out via Bondi, over what is now the low-lieing sand flats of Rose Bay.
Water draining from Middle Harbour still escaped at this time via the Heads.
And there was a minor channel running straight out through what is now the Manly Corso.
It wasn't until the landbridge between Middle Head and South Head was eroded away, along with the closure of the Bondi passage by alluvial deposition, that the single harbour entrance that we know recognise as Port Jackson was formed.
Sow & Pigs reef is the submerged echo of the Mosman / Vaucluse landbridge.
North Head is predominantly composed of Hawkesbury sandstone, however it also contains lenses of shale and volcanic intrusions - as can be seen forming the leading edge to the rock platform on the lower left side of the image above.
Tony landing his fibre-glass hull on the barnacle-encrusted rock platform of Salmon Cove.
The broad rock platform on the north side of Salmon Cove displays the distinctive north-east parallel fracturing which is so characteristic of the sedimentary rock around Sydney Harbour.
Sunday, November 8, 2009
After meeting up at South head, Derek, Tony and Peter decided against an open ocean adventure as an easterly swell and wave action created a messy sea outside the Heads. Despite that we ventured around to the Oasis and then turned back around South Head to Chowder Bay with the thought to undertake some rolling practice and search for sea horses.
Not much luck on the seahorse front unfortunately, however we almost succeeded in getting Derek rolling. With chilled torsos and little UV on offer, Tony kindly shouted us all a coffee and Derek thoughtfully brought a stash of chocolate croissants. Eventually when Peter's fingers returned some colour, we headed back north.
King T with his latest sea catch.