by: Charles O’Dale

HOW TO IDENTIFY AN IMPACT STRUCTURE/CRATER
DOCUMENTED CRATERS/STRUCTURES:
1. BARRINGER
2. BEAVERHEAD
3. BRENT
4. CALVIN
5. CARSWELL
6. CHARLEVOIX
7. CLEARWATER EAST/WEST
8. CHESAPEAKE
9. CLOUD CREEK
10. CROOKED CREEK
11. DECATURVILLE
12. DEEP BAY
13. DES PLAINES
14. DOUGLAS
15. EAGLE BUTTE
16. ELBOW
17. FLYNN CREEK
18. GLASFORD
19. GLOVER BLUFF
20. GOW
21. HAVILAND
22. HIAWATHA
23. HOLLEFORD
24. ILE ROULEAU
25. KENTLAND
26. LAC COUTURE
27. MANICOUAGAN
28. MANSON
29. MAPLE CREEK
30. MIDDLESBORO
31. MISTASTIN
32. MONTAGNAIS
33. NEWPORT
34. NICHOLSON LAKE
35. PILOT LAKE
36. PINGUALUIT
37. PRESQU’ILE
38. RED WING
39. ROCK ELM
40. SLATE ISLANDS
41. STEEN RIVER
42. ST. MARTIN
43. SUDBURY
44. VIEWFIELD
45. WANAPITEI
46. WELLS CREEK
47. WEST HAWK
48. WHITECOURT
49. LAC LA MOINERIE
50. HUDSON BAY (NASTAPOKA) ARC
EXPLORED CRATERS/STRUCTURES SORTED:
CONFIRMED;
PROBABLE;
PROPOSED;
IMPROBABLE;
NON-IMPACT CIRCULAR STRUCTURE.
ALL STRUCTURES ALPHABETICALLY
CRATER EXPLORATION ACQUAINTANCES
PERSONAL EXPLORATIONS
MY AMATEUR ADVENTURES IN CRATER EXPLORATION;
VIDEOS OF “STUFF” I HAVE BEEN UP TO IN THE PAST LITTLE WHILE
JOURNAL of the RASC – PINGUALUIT IMPACT CRATER;
SMITHSONIAN – PINGUALUIT IMPACT CRATER;
SKY NEWS – CANADIAN IMPACT CRATERS;
CANADIAN CRATERS;
2001 CRATER TOUR QUEBEC CANADA
EARTH SCIENCE PICTURE OF THE DAY
- BRENT – BRECCIA LENS
- CHARLEVOIX – SHATTER CONE
- MANICOUAGAN – BRECCIA
- MANICOUAGAN – IMPACT MELT
- MEREWETHER – ENIGMA
- SLATE ISLANDS – SHATTER CONE
PHYSICS OF IMPACT CRATER FORMATION
- Air&Space SMITHSONIAN
- United States Meteorite Impact Craters
- Ernstson Claudin Impact Structures – Meteorite Craters
- Crater Research: A History
- A CATASTROPHE OF COMETS
- The recognition of terrestrial impact structures
- Large Meteorite Impacts and Planetary Evolution II
- Traces of Catastrophe
- B612 Foundation
- WHY DOES THE MOON HAVE CRATERS?





EXTINCTIONS:
TWO EXTINCTIONS AND THE DINOSAURS;
YOUNGER DYRYAS (yd) Abstracts/Papers


– W. Durant –

Components of the RASC Sesquicentennial Logo:
The aurora borealis is a quintessentially Canadian space-weather phenomenon, one shared with other high latitude cultures. RASC members have contributed to the scientific, historical, and artistic investigation of the northern lights, and have promoted their recreational enjoyment.
The Manicouagan astrobleme (214 ± 1 Ma) represents the major discovery of sites of impact cratering in the Canadian Shield, an effort pioneered by astrophysicists and geophysicists at the Dominion Observatory (ca. 1950-), many of whom were RASC members. This world-impacting research played a crucial role in changing scientific and popular perceptions of crater-forming mechanisms, solar-system history, and planetary geology. The representation of the crater also acknowledges Canadian excellence in meteor dynamics, meteorite petrology, meteorite curation, and the RASC’s long-standing interest in such work.
The stars represent the major Canadian contributions to stellar spectroscopy done at the Dominion Observatory, the Dominion Astrophysical Observatory (also see this), the David Dunlap Observatory,(additionally refer to this) and elsewhere (ca. 1905-), whose major contributors were also RASC members (such as J.S. Plaskett [1865-1941], the first Canadian astrophysicist of international repute). The stars also symbolize the asteroseismology, exoplanet transits and eclipses, and investigations into stellar variability through precise photometry achieved by the Microvariability and Oscillations of STars space telescope(MOST, 2003-).
The globular cluster recognizes the field of Helen Sawyer Hogg‘s (1905-1993) greatest scientific contributions (ca. 1926-ca. 1993), and the Helen Sawyer Hogg Telescope (HSHT) at the University of Toronto Southern Observatory at Cerro Las Campanas, one of Canada’s first ventures (1971-1997) in exploring off-shore astronomical installations, which has born lasting fruit in international cooperative installations exploring the full range of astrophysical phenomena, such as the Canada-France-Hawaii Telescope (CFHT, 1979-), the James Clerk Maxwell Telescope (JCMT, 1986-2015 [period of direct Canadian involvement & funding]), the Gemini Telescopes (North 1999-, South 2000-), the Atacama Large Millimetre Array (ALMA, 2011/2013-), the Square Kilometre Array (SKA, 2020-), and the Thirty Metre Telescope (TMT, ca. 2022-).
The spiral galaxy represents both the work of Canadian observational cosmologists (e.g., Sidney van den Bergh‘s classification of Galaxy morphology, Laura Ferrarese‘s work on the morphology & dynamics of early type galaxies), as well as the efforts of amateur Canadian observers of deep-sky objects (DSOs), and imagers.
The comet stands for the contributions to cometography by Canadian comet discoverers, such as David Levy, Rolf Meier, and Chris Wilson.
The Moon symbolizes an object important for first nations’ calendrics, and the earliest recorded observations by Europeans in Canada (17th century lunar reports, and lunar eclipse reports). The Moon together with the stars symbolizes the practice of navigational astronomy on land and water, which was crucial to the formation of Canada. Finally, the Moon is as popular an object for RASC members to share with the public when doing outreach as it was 150 years ago.
R.A. Rosenfeld
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