F 01 Fingal Sunrise
Fingal Head in Northern New South Wales is so beautiful and certainly not an easy spot to photograph! I struggle to tackle the dark rocks in contrast to the brightness of the new day, any hints would be great appreciated.
Canon 5Dmark iii
The columnar basalt lava flow at Fingal Head extends underwater to Cook Island (named after Lieutenant James Cook who explored the east coast of Australia in 1770). The lava is thought to have come from the prehistoric Tweed Volcano and is known as "Lismore Basalt"; predominantly tholeiitic with occasional alkaline types. This unit is stratigraphically equivalent to the Beechmount Basalt in Queensland.
The jointing, clearly evident at Fingal Head is caused by contraction: as lava cools from the outside toward the centre, shrinkage cracks develop, usually forming hexagonal patterns (the shape of the columns is attributed to tensional stress). These columns are vertical because the lava cools from top to bottom when the flow of lava is horizontal.