RE: Canadian Coal - depositional setting

From: Sheila Wilson <sheila-wilson@sbcglobal.net>
Date: Mon Jan 19 2004 - 09:49:21 EST

Two centimeters per minute continuously for two days seems like a lot. The real problem is that the burrows do not just go straight up but are often limited to a single layer with very few burrows penetrated two to three layers and none penetrating all the layers vertically. Organisms appear to burrow across a single layer searching for food within the layer.
 
Sheila
[geologist]

Glenn Morton <glennmorton@entouch.net> wrote:
 
-----Original Message-----
From: asa-owner@lists.calvin.edu [mailto:asa-owner@lists.calvin.edu]On Behalf Of Bill Payne
Sent: Sunday, January 18, 2004 11:41 PM
 
Kevin Wrote:
> There is a 50 meter thick sandstone with burrows at most levels. You tell
> me - can these animals burrow 50 meters upward in two days?
 
Bill replied:
 
That would be 25 meters/day, or about 1 meter/hour, or less than 2 cm/minute. What's the problem?
 
GRM: When do they eat? When do they rest? How do they breath when buried by such an amount of dirt? The burrowers are not tiny terminator robots.

Sheila McGinty Wilson
sheila-wilson@sbcglobal.net
Received on Mon Jan 19 09:49:43 2004

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