[meteorite-list] Pseudocraters Never Die (Phillips County, Montana)

From: Galactic Stone & Ironworks <*meteoritemike_at_meteoritecentral.com*> Date: Mon, 3 Sep 2012 14:16:33 -0400 Message-ID: <CAKBPJW8PcEjsW_JaUD1TxQV61if2k=QYBsQy+n8u2+dQqzjGqw_at_mail.gmail.com> · meteoritemike_at_meteoritecentral.com

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On 9/3/12, Paul H. <oxytropidoceras at cox.net> wrote:
> On the Internet, known pseudocraters ( craterwrongs )
> never seem to die. They seem to get endlessly recycled
> as seen in a rambling article, ?The Younger Dryas Impact
> Event and the Cycles of Cosmic Catastrophes,? reprinted
> by RH on July 5, 2012 at:
> http://nexusilluminati.blogspot.com/2012/07/younger-dryas-impact-event-and-cycles.html
>
> This web page cites
>
> Geologists may have found 'new' meteor crater ? Montana
> by Annette Hayden, Havre Daily News, June 11, 2007.
> http://sinkholeswww.sott.net/articles/show/134335-Geologists-may-have-found-new-meteor-crater-Montana
>
> This circular feature is located at Latitude: 47.804896?:
> Longitude: -108.631878? in Phillips County, Montana,
> about 14.5 km southwest of Zortman, Montana.
>
> as can be seen at:
> http://maps.google.com/maps?f=q&hl=en&q=montana&ie=UTF8&ll=47.827793,-108.679848&spn=0.071453,0.150719&t=h&z=13&iwloc=addr&om=1
> and http://www.sott.net/image/image/1705/NewMeteorCraterMinn.gif
>
> Unfortunately, these circular features are not impact craters.
> These features, which partially surround the Little Rocky
> Mountains, are eroded surfaces of circular structural domes
> created by the uplift of sedimentary strata overlying laccolithic
> intrusions composed of syenite porphry.
>
> These laccoliths are discussed in "Geology and Physiography
> of Fort Belknap" at:
> http://serc.carleton.edu/research_education/nativelands/ftbelknap/geology.html
>
> A geologic cross section of these circular features can
> be found at:
> http://serc.carleton.edu/images/research_education/nativelands/ftbelknap/crosssection.gif
>
> According to the above web page, a laccolith is a ?concordant
> igneous intrusion that has domed the overlying rocks and has
> a known or assumed flat floor and a postulated dikelike
> feeder beneath its thickest point. It is roughly circular in plan,
> less than five miles in diameter, and from a few feet to several
> hundred feet in thickness.?
>
> The geology of these features is illustrated by:
>
> Porter, K. W., and E. M. Wilde, 2001, Geologic map of the
> Zortman 30' x 60' quadrangle, eastern Montana, Montana
> Bureau of Mines and Geology. Open-File Report 438,
> 16 p., 1 sheet(s), 1:100,000.
> http://www.mbmg.mtech.edu/mbmgcat/public/ListCitation.asp?selectby=series&series_type=MBMG&series_number=438&series_sub=&
>
> This report is available from:
> http://www.mbmg.mtech.edu/pdf_100k/zortman-text.pdf
>
> The 4.2 MB PDF file of the geologic map is available from:
> http://www.mbmg.mtech.edu/pdf_100k/zortman.pdf
>
> Publications about these circular geologic structures are:
>
> Collier, A. J., and S. H. Cathcart, 1922, Possibility of finding
> oil in laccolithic domes south of the Little Rocky Mountains,
> Montana. Bulletin 736-F (pp. F171-F178) United States
> Geological Survey, reston, Virginia.
> http://pubs.usgs.gov/bul/0736f/report.pdf
> http://ngmdb.usgs.gov/Prodesc/proddesc_93198.htm
>
> Knechtel, M. M., 1944, Oil and gas possibilities of the plains
> adjacent to the Little Rocky Mountains, Montana. Oil and Gas
> Investigations Map no. OM-4, scale 1:48000, U.S. Geological
> Survey, Reston, Virginia.
> http://ngmdb.usgs.gov/Prodesc/proddesc_32205.htm
>
> Knechtel, M.M., 1959, Stratigraphy of the Little Rocky
> Mountains and encircling foothills, Montana. Bulletin
> no. 1072-N, U.S. Geological Survey, Reston, Virginia.
> http://pubs.usgs.gov/bul/1072n/report.pdf
> http://ngmdb.usgs.gov/Prodesc/proddesc_20726.htm
>
> Web pages:
>
> Laccolith - http://en.wikipedia.org/wiki/Laccolith
> 2. What's a laccolith? - http://formontana.net/2a.html
>
> Syenite - http://en.wikipedia.org/wiki/Syenite
>
> I survived Hurricane Isaac without any damage. My
> power was off from about noon August 29th to about
> 10:30 PM, August 30th. So we were extremely lucky.
> However, there are thousand of people, who were
> badly hurt by Hurricane Isaac and can use any help
> and prayers that can be given them.
>
> American Red Cross ? Louisiana
> http://www.arcno.org
> http://www.batonrouge.redcross.org
>
> Best wishes,
>
> Paul H.
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