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By Don Winston, Robert J. Horodyski, James W. Whipple

About The Product

Published through the yankee Geophysical Union as a part of the Field journey Guidebooks Series.

The superior want of the 3 leaders is this box journey be a discussion board for alternate of principles between all contributors. the 3 folks have differing viewpoints of the Belt basin, and every will current his personal principles. we are hoping the consequent dialogue will stimulate reaction from visitor contributors, whose mixed reports in all these rocks most likely exceed ours. We inspire individuals to remark and to give a contribution to additional knowing those curious rocks.

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Read or Download Middle Proterozoic Belt Supergroup, Western Montana: Great Falls, Montana to Spokane, Washington, July 20-28, 1989 PDF

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Extra resources for Middle Proterozoic Belt Supergroup, Western Montana: Great Falls, Montana to Spokane, Washington, July 20-28, 1989

Example text

Erect Conophyton columns are relatively uncommon in this unit. Where present, they are smaller (515 cm wide) and form poorly defined meter-sized masses in the upper part of this unit. Branched columnar stromatolites in this unit are 5-20 cm in diameter and form bioherms a few decimeters to about 2 m high. Mound-shaped stromatolites one to several decimeters high are common in the upper part of this unit. Branched columnar stromatolites and mound-shaped stromatolites do not occur within the Conophyton bioherms; and, as in the underlying units, eroded stromatolite debris beds are common adjacent to Baicalia bioherms but do not occur within or between Conophyton bioherms.

1935, Pre-Cambrian life: Geological Society of America Bulletin, v. 46, p. 375-392. , 1957, Stromatolites of the Belt Series in Glacier National Park and Vicinity, Montana:. S. Geological Survey Professional Paper 294D, p. 127-154, pI. 18-24. -----1963, Paleontologic criteria, in Ross, C. , The Belt Series in Montana: U. S. Geological Survey Professional Paper 346, p. 33-38. Ross, C. , 1959, Geology of Glacier National Park and the Flathead Region, Northwestern Montana: U. S. Geological Survey Professional Paper 296, 124 p.

Stromatolites from the lower Snowslip ~ormation, Pollock and Piegan Mountains, Glacier National Park, Montana. They are shown in outcrop (A & B), in polished slab (C & D), and in thin section. The tabular crystals in E are barite. The white bar is 5 cm long in A, 10 cm long in B, 1 cm long in C, 2 cm long in D, and 5 mm long in E. stromatolite cycles. The low abundance of. stromatolites in the remainder of the Helena (Siyeh) Formation, relative to some Proterozoic platform sequences, could be due to two factors.

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