Whitney J D M E Wadsworth (7 results)

Hardcover. Condition: Near Fine. A beautifully clean, crisp, (near fine) rebound hardcover copy; former owner's name plate on paste down. No DJ, as issued.

8vo. XVI, S. 331-565. Originale Broschur. (Bulletin of the Museum of Comparative Zoölogy, at Harvard College. Whole Series, Vol. VII., Geological Series, Vol. I., No. XI.).

Soft cover. 24.5cm, xvi, p.331-p.565 (224p.), some leaves uncut, printed wraps, spine & edges of covers chipped, printed presentation slip laid in, fine (ds25.1). The rocks of the Azoic System have been grouped into distinct geographical divisions. Includes Canada (Logan), New Brunswick (Dawson), Nova Scotia (Hind), Newfoundland (Jukes) and Labrador (Packard). An interesting association copy: signed by Robert Bell of the Geological Survey of Canada. …

Hardcover. Condition: Used - Good. Cambridge: August, 1884. xvi, pages 331-565. 9.5 x 6", half leather, gilt spine, marbled paper boards. Cover well scuffed, text lightly toned, VG.

Paperback. Condition: New. Print on Demand. This book examines evolving classifications for Canada's Azoic System, a geological period before the Cambrian era. It focuses on how the system was originally divided into two series called Laurentian and Huronian by the Canadian Geological Survey, and how this simple division became increasingly complex over time. The book analyzes these divisions, using evidence from the field and from the work of geologists over more than half a century, to explore their validity. The author points out that the divisions were based on assumptions about rock sequences proposed by Sir William Logan in the mid-19th century, and that these assumptions have not always held up to more recent scrutiny. Through this analysis, this valuable book provides insights into the history, methods, and complexities of geological classification. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.…

XVI S., S. 331-565. Hlwd. Einbd. etwas berieben. (Bull. of the Museum of comp. Zool. at Harvard Cool. 7/11). Sprache: Englisch 0 gr.

xvi, 235 p., paperbound (paper brittle, edges covers somewhat chipped). Library stamps, a fold in lower corner of several pages, unopened copy. Published in: Bulletin of the Museum of Comparative Zoology at Harvard College. On precambrian geology.