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Re: 'Mars Rocks' -another opinion
- To: meteorite-list@meteoritecentral.com
- Subject: Re: 'Mars Rocks' -another opinion
- From: "E.P. Grondine" <epgrondine@yahoo.com>
- Date: Sun, 3 Oct 1999 00:23:29 -0700 (PDT)
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- Resent-Date: Sun, 3 Oct 1999 03:24:15 -0400 (EDT)
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Hello all -
Hum, let's see. I was haranguing Ron about the
craters and impact debris about a year ago. I wonder
how long it will be before they get around to the
tektites.
EP
--- jjswaim <MissionControl@email.msn.com> wrote:
> Hi list,
>
> With regard to this story from last week, below is
> an opinion from Dr. James
> W. Rice, Jr. offering floods as the culprit in a
> letter to explorezone,
> from whom the story came.
>
> Hello List, (From 9/23/99)
> "New research, to be reported in Friday's journal
> Science, shows that
> pebble-sized projectiles are making a lot of little
> dents in the landscape
> of Mars. "
>
> Story at:
>
http://www.explorezone.com/archives/99_09/23_mars_rocks.htm
>
> Best Regards,
> Julia
>
> 10/01/99
> "Dr. James W. Rice, Jr., a geologist at the Lunar
> and Planetary Laboratory
> University of Arizona and team member of the Mars
> Polar Lander Surface
> Stereo Imager and Robotic Arm Camera, wrote to
> explorezone.com to offer this
> possible alternate explanation:
>
> "I am a geologist studying Mars geomorphology and I
> also conduct geological
> field investigations in regions on Earth that are
> Mars analogs (Antarctica,
> High Arctic, Iceland). I have been conducting field
> research in Iceland for
> the past two years. I am specifically working on the
> catastrophic flood
> deposits from jokulhlaups, these are glacial
> outburst floods.
>
> "It is quite common to observe small rocks and
> boulders with percussion
> marks. Percussion marks are created by the grain to
> grain contact or impact
> of rocks banging into one another during flood
> events. These rocks have
> corners knocked off or display small crater forms.
>
> "I have been in the field during flood events and
> heard boulders slamming
> into one another in the water column. It sounds like
> distant thunder. The
> flood induced rock collisions also create smaller
> rock fragments, these
> fragments are usually angular.
>
> "We know that Pathfinder landed on a flood deposit
> and therefore it seems
> much more likely to me that these features and rock
> fragments are from the
> flood(s) that flowed across this region of Mars and
> not impact craters!"
>
> Best wishes,
> Julia
>
>
>
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