The average extinction probability in the preglacial period is significantly lower than that for both the glacial and preglacial periods. |
|
For most of his life, he worked on preglacial river valleys in Ontario, and the origin and extent of proglacial precursors of the Great Lakes. |
|
Huge stores of these waters are buried in preglacial valleys in central and south-central Ohio. |
|
These all originated in preglacial valleys, the two reaches forming part of a system of parallel northeast-southwest valleys. |
|
Occurring less frequently are outwash aprons of crudely sorted sand and gravel, and raised beach ridges along the shores of phantom preglacial lakes. |
|
Kimberlite, being relatively soft, was differentially eroded by preglacial weathering and glaciers such that kimberlite pipes subcrop 20 to 50 m below the surrounding bedrock. |
|
The gross geography of Scania reflect more the preglacial development than the erosion and deposits caused by the Quaternary glaciers. |
|
A geological deposit in East Anglia marks the old preglacial northward course of the Rhine. |
|
The reason is that a continental glacier completely disrupts the preglacial drainage system. |
|
Several modern species are believed to form an ancient group of related taxa from preglacial times. |
|
As in the rest of the shield, glaciers have stripped soils away, strewn the surface with boulders and other debris, and obliterated preglacial drainage systems. |
|
Following a tortuous course laid out in preglacial times, it flows in a generally northwesterly direction from its source to the Lackan Reservoir, the site of a gorge cut through the Slievethoul ridge. |
|
Therefore, the possibility of at least one stage of preglacial fluvial transport has to be considered in determining the ultimate provenance of these minerals. |
|