Consider the Missoula Floods, the Channeled Scablands, and the Pleistocene Glaci

Question

Consider the Missoula Floods, the Channeled Scablands, and the Pleistocene Glaciation when answering the following Questions: 1. The Missoula Floods are estimated to have been repeated up to 40 times and the Ice dam was burst, refrozen, and burst again. It was a time of global climate change. What other indicators from the sedimentary and fossil record suggest that there was significant climate change? 2. What evidence did Pardee and others offer to explain the Channeled Scablands? What evidence was presented that suggested Lake Missoula was the source for the glacial floodwaters? 3. Though many authors in Bretz's time presented data at national geology conventions, how did many of the geologists test their new ideas, and convey their conclusions to their peers?

Explanation / Answer

1. Indicators that suggest there was a significant climate change is-

Sedimentary -With in the basin detailed investigation of the Missoula floods glaciofluvial deposits, also known as Hanford fomation has documented the presence of Missoula floods .Also based on the presence of multiple interglacial calcretes interbedded with flood deposits.

Thundering waves and chunks of ice tore away soils and mountainsides, deposited giant ripple marks, created the scablands of eastern Washington and carved the Columbia River Gorgen during floods. Over the course of centuries, Glacial Lake Missoula filled and emptied in repeated cycles, leaving its story embedded in the land.

Fossils- It is surprising that no one has found fossils in Glacial Lake Missoula sediments—no petrified wood, no leaves, no bones. We have no tangible record of the plants and animals that lived in Glacial Lake Missoula or around its shores.

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