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RASC St. John's Centre Monthly Meeting
AGM
October 20, 2004
Location: Chemistry/Physics Building, MUN
Time: 8:00 pm
Present: 19
Randy made a note that this was in fact our AGM. Monday night, Davis Earle
will be at E2018A at 7:30 pm, the talk will be on Observing the Sun from 2 km
underground. Don't forget about the lunar eclipse next week!
Glyn George presided as Election Officer.
- President: Chris Stevenson by Acclamation.
- Vice-President: Gary Case by Acclamation.
- Secretary: David Bourgeois by Acclamation.
- Treasurer: Florence McNeily by Election.
- Mover: Randy Dodge for Florence McNeily.
- Mover: David Bourgeois for Craig Peterman.
- Mover: David Bourgeois for Doug Grouchy.
- National Representative: Vacant.
- Three declined the position.
- Observing Chair: Robert Babb by Acclamation.
- Equipment Officer: Brian Payton by Acclamation.
- Webmaster: Craig Peterman by Election.
- Mover: Gary Case for Craig Peterman.
- Mover: David Bourgeois for David Caruk.
- Librarian: Fred Smith by Acclamation.
- Past-President: Randy Dodge.
Gerry works as a Mineral Deposits Geologist with the Newfoundland and Labrador
Geological Survey. He is also a member. His talk is on _Terrestrial Impact
Cratering_. He presents a few local examples, as well. This is also a
practice run for a talk he will be giving when the Survey runs a public
event(s) in November.
Information for the talk was provided from many places, including the
Geological Survey of Canada, which has a site at the University of New
Brunswick.
Some of the topics of the talk:
- Geological Effects of Impact.
- Environmental Consequences of Impact.
- Earth/Moon Formation.
- Types of meteorites: chondrite and stony-iron.
- Tunguska: 10km size, flattened 2000 km^2
- 1 km crater implies the impactor was vaporised.
- Complex crater: > 8km, uplift and rings.
- Geomorphic changes: shatter cones, quartz dislocations (10-70 km/s speeds), melted, shattered granite.
- There are about 170 known craters on the earth. Surprisingly, they can be economically important.
- Farming
- Vredefort dome (50 km) at the Witwatersrand Basin is an enriched gold field. At 300 km it is the largest extant impact structure, though no crater is left.
- Oil producing (fracture patterns ideal). Chicxulub, near the Yucatan in Mexico. [The BIG one.]
- Sudbury Basin. About 60 km. This was 250 km in size, but erosion and movement has taken place.
- A tour of Sudbury and other Canadian craters.
- Manicouagan.
- East/West Clear Water Lakes here in NL.
- Mistastin Lake.
- Merewether Crater
- Could be 3 in total
- Not studied, so no proof its an impact
- About 200 m in size
- Not in bedrock
- Steep walls
- Health Sciences/Pippy Park, St. John's
- Retrieved and took pictures of shattercones before buried by construction.
- One rock on display at MUN Geology Department.
- Again, not studied to show it was due to impact
- "Howley's Comet"
- January 19, 1986.
- Flight path roughly south east from observer's reports
- Near lakes Howley, Ambrose.
- Descriptions match those of a large meteorite siting, including one or two of a dust cloud being released.
- Possible sitings of more than one/breaking up of object.
- Discovery at Ahwachanjeesh Pond of a trench, with pictures. Whatever happened required force and or speed. Matches with the second flight path acquired after all the data put together.
- Dr. Rex Gibbons and other provincial people scrounged a few dollars to look into this, but had no luck in finding any remains. [Dr. Gibbons has spoken about this in a talk to us, as well.]
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David Bourgeois
This document was generated using AFT v5.095 and Vim on: Tue Nov 2 12:55:18 NST 2004