Friday, 24 March 2017

Next week 27th March to 2nd April 2017

Next Weeks EVENTS

27th March to 2nd April 2017
The following is an extract from Bristol Geology Calendar

More details can be found in the Calendar and on the web sites of the relevant Society or organisation.


Monday




Tuesday




Wednesday

19:30
 Bristol Nats Lecture - The Origins of Dolomite
WhenWed, 29 March, 19:30 – 20:30
WhereS H Reynolds lecture Theatre, Wills Memorial Building, University of Bristol, BS8 1RJ (map)
DescriptionProfessor Maurice Tucker: The Origins of Dolomite Dolomite is a common sedimentary rock – plenty in the Bristol district and South Wales in the Carboniferous and Triassic, but there is a problem in explaining its origin. Seawater is supersaturated with respect to dolomite but it does not precipitate there; dolomite appears to increase in abundance back through time, being especially common in the Precambrian; to dolomitise a limestone needs much Mg and through-flow of water – but how does that work? Dolomites are very important as reservoirs for oil and hosts of lead-zinc sulphide deposits, so understanding their origin and geometry is important. This talk will examine dolomites from around the world and up and down the geological column and discuss the hot topic as to whether microbes provide the answer. Members of WEGA and other local geological societies are invited to attend and bring proposals for field meetings for 2017.


Thursday




Friday




Saturday




Sunday




WEGA's NW USA Excursion

At Long Last - WEGA's NW USA Excursion Blog.


At last, 9 months in the making, the record of WEGA's excursion to the North West USA is published. Lots of geology, lots of maps, lots of photos find it HERE.




Gypsum sand dunes

Gypsum Sand Dunes - but the Grains are Too Big!

The Salar de Gorbea in the Atacama in Chile has gypsum sand dunes, like White Sands National Monument in New Mexico, USA. But, at White Sands the grains are small and wind blown, at the Salar they are up to 20cm! But they look wind blown! 

THIS ARTICLE in the Economist discusses how such huge crystals get to the dunes from gypsum producing ponds 5km away. Dust Devils? - perhaps.


Thursday, 23 March 2017

Spherical world - flat maps

Map projections

This has little to do with geology but as we are always dealing with maps it is not without interest. read all about it HERE




Dinosaurs revisited - again

Will the Dinosaur Family Tree be Rewritten?

Mike Benton writes HERE that recent research in cladistics might necessitate a reappraisal of dinosaur evolution. I don't pretend to understand it but it is probably important!


Tuesday, 21 March 2017

Jokes

Geological Jokes

While procrastinating in front of my computer I came across THIS PAGE. I expect that the jokes may elicit a few groans - Some were old when I was a boy in the Holocene.


Geological Photos

Rather Nice Geological Photos - Mostly


I found these photos online and thought some of them were rather good. Hope you like them.