Including Original "Paul H. Letters" Copyright © 1996-2018 Paul V. Heinrich - All rights reserved.

Tuesday, 20 November 2007

Another Possible crater?

Another Possible crater?

Paul bristolia at
Tue Nov 20 23:08:04 EST 2007

Jerry wrote:

"This is copied from the article that you supplied

"We will defiantly let you know the outcome of the
research," they said.

Seems there's been quite of few of those threats on
the List this year. Maybe things will calm down to
normal next year and folks will get back to just
nicely reporting the facts.” "

The origin of these features was discussed back in
June. There are some really nice geological maps,
which show this feature to be a domal uplift, which is
only one of a number of laccoliths and other igneous
intrusions. It is just one of several circular features
of igneous origin that occur locally.

Go look at

There I stated:

"Using information given in the article, I used Google
Earth to find the the location of the structure, which
it discusses. The latitude and longitude of this
structure is:

108.6729941879148 W

47.82294379843308 N

It is on the edge of hills known as "The Little Rocky
Mountains". There a number of circular structure
within the region associated with laccolithic intrusions.

There is a discussion of this in "Geology and Physiography
of Fort Belknap" at:

The "Geologic Map of the Zortman 30' x 60' Quadrangle,
Central Montana" can be downloaded from:


Two publications on the geology of the area are:
Knechtel, M.M., 1944, Oil and gas possibilities of the
plains adjacent to the Little Rocky Mountains, Montana:
U.S. Geological Survey, Oil and Gas Investigations
Map OM-4, scale 1:48000.

Knechtel, M.M., 1959, Stratigraphy of the Little Rocky
Mountains and encircling foothills, Montana: U.S.
Geological Survey, Bulletin 1072-N, scale 1:48000.”

Best Regards,


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