Jasper conglomerate (aka puddingstone) - Lorrain Formation
Ripple marks - Bar River Formation, Flack Lake area
Uraniferous conglomerate - Matinenda Formation, town of Elliot Lake.
FIELD TRIPS
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A number of pre- and post-meeting field trips are being offered. Most of the stops are road-accessible and involve minimal walking. The Wawa Diamonds trip is being offered twice due to anticipated high demand and limited spaces.
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Monday, May 8 and Tuesday May 9 - Leader: Gerry Bennett (retired OGS)
This trip will transect the Paleoproterozoic Huronian Supergroup in the Elliot Lake and Searchmont areas. Visits to classic exposures of uraniferous conglomerates, ripple marks and glacial drop stones in the Elliot Lake transect. The Searchmont transect examines seldom visited exposures of the Huronian north of Sault Ste Marie. Exposures of puddingstone and stromatolites will be visited.
Tuesday, May 9 - Leader: Ann Wilson (OGS)
A one-day field trip will examine the 2700 m.y.-old Archean diamondiferous breccias of the Michipicoten greenstone belt. Outcrop visits will include the Sandor discovery site, the GQ discovery site and the Engagement Zone.
Friday, May 12 - Leader: Tom Hart (OGS)
Mesoproterozoic rocks are well exposed along the shoreline of Lake Superior north of Sault Ste Marie. Basaltic flows with well preserved ropy pahoehoe surfaces and plagioclase-phyric to glomerophyric textures will be highlighted.
SFriday, May 12 - Leader: Ann Wilson (OGS)
See description for trip 2, May 9, 2006.
Friday, May 12 - Leader: R. P. Sage (retired OGS)
Mackinac Island represents one of the best exposures of Silurian and Devonian aged rocks along the Michigan Basin perimeter. The one-day bike trip visits all major bedrock exposures that have affected the tourist economy of the island and examines the erosive effects of the glacial lakes from the retreating Wisconsin ice sheets. Participants must bring their own bicycles. Rental bicycles are not available in early May.
Friday, May 12 - Leaders: Mike Easton (OGS) & Dick James (Laurentian University)
Intrusions of the ~2480 m.y. East Bull Lake intrusive suite occur as an ENE-trending belt along the boundary between the Archean Superior and the Proterozoic Southern provinces. The trip will illustrate important aspects of the geology, stratigraphy and PGE mineralization of the intrusion.
Photo Captions
Click on any photo for full size image.
Trip (1) - Classic Stratigraphy of the Huronian Supergroup - Elliot Lake & Searchmont Transects
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Jasper conglomerate (aka puddingstone) - Lorrain Formation |
Ripple marks - Bar River Formation, Flack Lake area |
Uraniferous conglomerate - Matinenda Formation, town of Elliot Lake. |
Trips (2&4) - Unusual Archean Diamond-bearing rocks of the Wawa Area
 GQ Discovery site - diamondiferous breccia. |
 IMoet Occurrence - diamondiferous breccias |
 Engagement Zone - diamondiferous heterolithic breccia |
Trip (3) - Keweenawan Rocks of the Point Mamainse Area
 Chipewa Falls Roadside Park - unconformity between Keweenawan pillowed basalt and Archean granite. |
 Ropy flow tops - Sand Bay, Lake Superior. |
 Daisy stone - Highway 17 N. |
 Oronto Group sediments - Mica Bay. |
Trip (5) - Glacial Lakes Algonquin and Nipissing Shoreline Bedrock Features - Mackinac Island, Michigan
 Sugar Loaf Rock - Mackinac Island. |
 Arch Rock - Mackinac Island. |
 Mackinac Breccia close-up |
Trip (6) - Geology of the Paleoproterozoic East Bull Lake Intrusion
Stone quarry in nodular anorthosite unit of Agnew Lake intrusion. |
Close up of nodular anorthosite showing closely-packed plagioclase glomerophenocrysts. |