Robert Flory wrote:
"Robert Clark" wrote in message
m...

On the other hand if the spherules are ubiquitous even outside the
crater will you admit that you are wrong?
See this report for analogs on Earth for the spherules:

Mysteries of Sandstone Colors and Concretions
in Colorado Plateau Canyon Country
By Marjorie A. Chan and William T. Parry
http://www.ugs.state.ut.us/online/pdf/pi-77.pdf

Especially the Introduction and Section 3.


Bob Clark



Thanks Bob, I knew I'd seen spherules somewhere and couldn't remember.

Another
Bob

Bob F.,
Hi there. Did you see the hematite spherulites I posted about a
month ago about 2/15? http://members.socket.net/~joschaper/erthrock.jpg

The two in-situ spherulite rocks are in a basaltic ashfall, circa 1.4 Ga
in age. The spherulites themselves are iron--probably hematite, not
magnetite, tho there is magnetite around also. Genesis supposedly as a
secondary hydrothermal infilling of gas vesicles. about 2-5 mm in size,
and despite Missour humidity, they haven't rusted that much.

In contrast, Rock 3 contains lithophysae, or lapilli, or whatever you
want to call
them in a banded rhyolite from nearby. The spherulites are slightly
darker than the ashy/crumbly matrix in photos 1 and 3.

No one seems to have paid much attention to them, save Paul Y.

best regards,
Jo