Ashlayers (rhyolitic, white, and basic, black) exposed in pit. From bottom to top. Hekla 4 (4000 years ago, white with black), Hekla 3 (about 2700 years B.P., white), Hverfjall (about 2500 B.P., basic volcanic ash), laxa (about 2000 B.P., basic). Near Ludent crater. August 4, 1960.

Ashlayers (rhyolitic, white, and basic, black) exposed in pit. From bottom to top. Hekla 4 (4000 years ago, white with black), Hekla 3 (about 2700 years B.P., white), Hverfjall (about 2500 B.P., basic volcanic ash), Laxa fall (about 2000 B.P., basic). Near Ludent crater. August 4, 1960.

Aspen "bluff" in winter. Along highway 5, east of Saskatoon.

Aspen "bluff" in winter. Along highway 5, east of Saskatoon. Note convex profile of grove with younger trees in outer part.

Assembly of jeeps near Ludent crater group. August 4, 1960.

From left to right: Fred Carrothers, Ron Hodghinson, Stuart Lake, Lyle Gillespie at Lynn Lake airport. July 31, 1965.

Athabasca River near McMurray, Alberta. Photograph taken from the air.

"Athabasca tar sand" (McMurray formatio of Lower Cretaceous age). Hangingstone Valley near Waterways, Alberta. Colin McKenzie looking at outcrop.

Diagram of a Babylonian coffin with bituminous coating. Diagram copied from a book.

Baculites compressus. Say, from the Cretaceous of the South Dakota. 1. A young shell preserving the early coils. The living chamber occupied about one half the length of the shell. 2. A specimen of the same size as the last but with the outer shell broken away revealing the sutures - the outer edges of the septa. Note the variations in the sutures from the apex of the shell 2 to its wide end and on through the progressively layer shells as shown in 3, 4, 5, and 6, which represents the condition of the suture in the adult shell.

Badlands. Fort Union formation (Paleocene). Theodore Roosevelt Park, N.D. Sign explaining the origin.

View of the Badlands. Fort Union formation (Paleocene). Theodore Roosevelt Park, N.D

Badlands. Fort Union formation (Paleocene). Theodore Roosevelt Park, N.D.

Badlands in Upper Cretaceous Edmonton Formation along Red Deer River near Drumheller, AB. On Dinosaur Trail. November 10, 1962.