Latest Posts

TERRACE, BC 270 mya Metamorphic rocks, green volcanics -volcanic island arc similar to Japan or Aleutians, with limestone reefs forming in shallow waters surround these islands -Old Remo Rd. grey limestone exposures contains brachiopods, coral, crinoids, fusilinids 200 mya second mass of volcanoes built on top of first one, now brick red to purple rocks -Kitsumkalum Mountain 180 mya: Island Arc collide with western edge of N.A. as Atlantic Ocean opened and plate tectonics moved NA westward -lavas, limestone welded to edge of NA, creating mountains as units get deformed, folded and faulted 90-170 mya: Sedimentary rocks, some w/fossils, grey

Read More…

-Maligne Valley south of Jasper is a glaciated U-shaped valley 58 km long and 1.5-6.5 km wide -lake was dammed in northend by end moraine of Pleistocene glacier that flowed from SE to NW -highest peaks are south end of Maligne Lake (Mt. Brazeau 3470 m, Mt. Monkhead 3211 m), all Ordovician to Devonian 350-600 mya -east side of valley is steeply dipping limestone Devonian to Mississippian forming sawtooth mountains called Colin Range -west side is Cambrian & Precambrian quartzite and shales, which are more rounded due to glacier flowing over them >500 mya: oldest rocks are Precambrian Miette Group,

Read More…

-tectonic plates began moving 3 bya, most of which were ocean plates -two ocean plates crossing in subduction zone, create volcanism, island arcs, build continental crust -heavier ocean plate goes under continental plate but some ocean crust scraped & piled up on continent -Canadian Shield is the world’s biggest craton, grew by accretion -sediments and island arcs swept against craton’s size, creating various terranes welded to each other -3 Geological Provinces from oldest to youngest and sedimentary basins: Surperior 2.5-3.8 bya: 9 greenstone meta-volcanic & granite, 2 sedimentary, 1 granitic belts Southern 0.57-2.5 bya: flat lying seds at Elliot Lake

Read More…