Geology news

The story of the Chalk ... gets more intriguing as time goes by

At ... chalk deposits are formed from the white shells that envelop single celled photosynthetic alga known as Ehux, a coccolithopare with an exo skeleton made of calcium carbonate. Ehux, and related life forms, are the bedrock of most ocean food chains. Phytoplankton biomass exceeds that of all marine animals combined.

New subduction zone is forming off the coast of Portugal

Well, that is the headline at .... but it emerges that what has been found is an active tectonic zone to the west of Portugal - or rather, a reaffirmation that a fault line exists out in the sea which was responsible for the 1755AD Lisbon earthquake and tsunami.

The Inflating Earth and Gravity

The last of the three posts goes where it naturally weaves a path - .... and leads from the equatorial bulge to the question of gravity. For this he goes to which I mentioned a couple of days ago, the web site of Stephen Hurrell (dinosaurs and the expanding earth) - so you can have two bites of the same cherry.

The Equatorial Bulge

In the next of his posts on the Inflating Earth model, Tim Cullen turns to the equatorial bulge - how does this feature fit into the Expanding Earth hypothesis - see

Antarctica in an Inflated Globe

I seem to have got stuck on this theme of the Expanding Earth theory but here are another three pieces to look at by those still awake, or vaguely interested in the subject. At ... Tim provides a nice review of the frozen continent beneath the ice, courtesy of

More on Expanding Earth Theories - now we are here

The David Pratt article at ended in a bit of a drizzly fizzle as part of the Expanding Earth hypothesis includes polar wander - and he thought it was possible for scientists to track former pole positions. He claimed these began in Africa but gradually tracked southwards as the earth expanded. In other words, the Expanding Earth model is  uniformitarian in concept, and simply a variation, of sorts, of the Plate Tectonics model of consensus academic geology.

Decoding the Solar System

For an evaluation of Plate Tectonics and various expanding earth models go to

Sceptical scientists - expanding earth is nonsense

The Expanding Earth theory must have been getting under somebody's skin as the debate at ... appears to resort to the current fashion of attacking the messenger rather than the theory. Actually, there is not a great deal of difference in the Expanding Earth theory than that of Plate Tectonics, in that they are both based on looking at a map of the world and realising that at some point the continents must have been closer.

Water in the Sinai; feldspar in the atmosphere

At ... there is a lovely image of the Sinai peninsular overlain with the drainage network of Wadi el-Arish. According to a new study the traces of an ancient watershed in the Sinai Desert, from ten to five thousand years ago, is discernible. The Wadi el-Arish was once a major river with tributaries in the early half of the Holocene.

Plate Tectonics and water as a lubricant

At ... water as a lubricant of Plate Tectonics may be over rated according to geoscientists in the current issue of Nature - following the examination of water in the mineral olivine. Experiments suggest the presence of water actually weakens the mechanical strength of olivine, a key component within Earth's mantle - it is thought. The result is that the role of water within Earth's interior requires a reassessment. In fact, a major reassessment as water is supposed to provide the lubrication to move continents apart.