Regional Geology
The BGS has an interactive map of the Geology of the UK (Flash / Shockwave required). Outcrop distribution for different geological periods can be switched on or off and mousing over the information button for a period brings up a timescale for that period. Very useful for teaching stratigraphy. [Hat-tip: Highly Allocthonous Blog]
The Geological Society of Africa website, with free email newsletter.
The centre is the country’s focus for oceanography and represents an unparalleled investment in marine and earth sciences and technology in the UK. There are detials on the research done at the centre, including the recent "missing crust" story: http://www.noc.soton.ac.uk/nocs/news.php?action=display_news&idx=349
Ever wondered what Scotland was like in the past? Tropical seas, volcanoes and great rivers formed the rocks beneath our feet millions of years ago. These rocks have been sculpted and eroded to form Scotland's beautiful scenery. Join geologist Angus Miller for a walk back in time ...
Geology of Holyrood Park, Edinburgh
Geological history of the Galapagos Islands