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Geology, Palaeontology & Archaeology / Re: Geology Question of the Week

« on: 05/03/2006 01:53:30 »

quote:Originally posted by Bass



Maybe this belongs in the "Science Photo of the Week" thread, but the reference to cross-beds in this thread made it relevant.

This photo from the Mars Rover Opportunity near the edge of Erebus Crater shows good evidence for the historical presence of water on Mars- note the "festoons" or cross-laminations (curved upward layers) that indicate water-formed ripples.
http://www.spaceref.com/news/viewsr.html?pid=19212


Subduction causes orogeny.

Bass, may I politely disagree. I concur that this is evidence for water on Mars, but the structures to me look to be a series of seasonal dessication cracks that are stacked one upon another. To bad we can't get to the outcrop to determine the accuracy of the interpretation.

And orogeny causes uplift

6622

General Science / Re: Hair-drying question

« on: 05/03/2006 00:41:11 »

Duh, It's not the grease, it is surace tension.

Where's your head at? (chortle)

As you become more and more annoyed, you brain heats up causing your body to pump blood to that region, cooliong it to a lower degree than the rest of your body, thus causing the surface ....  hurmph,,,

Actually, Fresh water has a higher surface tension than water and shampoo. Being a surfactant the shampoo lets the water drain from you head much easier than if it were just fresh water. SO, being fresh water and matted hair, the water forms a mass of water around the grease which is less able to dry as this water is retained by the higher surface tension (compared to wtr & 'poo.)

6623

Plant Sciences, Zoology & Evolution / Re: name this Spider & help save a Bog UpDate!

« on: 04/03/2006 23:56:55 »

"I got this on in a bog in Ireland in oct 2006."

A man ahead of his time.

6624

Geology, Palaeontology & Archaeology / Re: Flightless birds?

« on: 04/03/2006 02:52:03 »

The theory is almost right - most raptor's do not have wings, just small arms. Feathers come next and then the wings. These raptors are Cretaceous and upper Jurassic dinosaurs I am speaking of, not Lower to Mid-Jurassic or any Triassic fauna. And there is controversy about birds comming from raptors - but as the old geezers (like me)are getting out of Paleontology, the issue is faily well settled. Sort of like the Plate Tectonic theory - when A.A. Meyerhoff died and stopped publishing in the AAPG Bulliten, it was accepted theory.  

As this is my first post I am putting everyone on notice - I don't spel reel gud. Please forgive the fact that a highly educated person could be that inattitive to his communiqués but it happens.

JimBob