CURIOSITY MARS ROVER CONTINUES DRILLING

Curiosity has drilled a second deeper hole in the rocked named 'Windjana' at the bottom of Mars' Gale Crater, a week after a test bore just a few centimetres away.
http://www.bbc.co.uk/news/science-environment-27298907

Professor John Grotzinger said his team was seeking further information on the role played by water in fixing the sediments that make up many of the rocks on the crater floor. 'We're most interested to find clues as to the aqueous geochemistry which resulted in cementation of the sedimentary rocks', he commented. The evidence indicates that the crater once held a lake, and the many rounded pebbles seen by Curiosity hint at the action of the water streams that may have fed that lake.

One obvious difference with the new sandstone hole in the Windjana rock compared to the previous drillings is the markedly darker colour of the particles.

Comment:  The new pictures show an obvious layered aspect of the rocks around Windjana, which look clearly sedimentary. It is brilliant that we are able to follow this scientific exploration of the Martian surface, as it happens.