When circular, or roughly circular, the diameter of this lichen species has been widely used to help determining the relative age of deposits e . g . moraine systems, thus revealing evidence of glacial advances.
42.
The glacial advances were interrupted by warmer periods during which ancient European man ( the Neanderthals, as successors of homo heidelbergensis ) spread out from the mountain zones and over the permafrost boundary to the north and northeast.
43.
Since new glacial advances tend to destroy older pushed moraines, most were formed during the last ( 110, 000 to 10, 000 years ago ) or second-last ( 238, 000 to 128, 000 years ago ) glacial advances.
44.
Since new glacial advances tend to destroy older pushed moraines, most were formed during the last ( 110, 000 to 10, 000 years ago ) or second-last ( 238, 000 to 128, 000 years ago ) glacial advances.
45.
"Ice Age " was helped by an enormously effective trailer, showing one of the film's fringe characters _ a rodent named Scrat _ causing massive glacial advance when he cracks an ice field while frantically trying to bury an acorn.
46.
It is believed that the region of the present-day West Pomeranian Baltic Sea coast after the last ice age glacial advance ( the North R�gen-East Usedom Step ) has remained ice-free and largely part of the mainland for about 13, 000 years.
47.
The trailer is basically the first few minutes of the movie, showing a goofy, fanged prehistoric creature called Scrat ( part squirrel, part rat ) causing massive glacial advance when he cracks an ice field while trying to bury his precious acorn.
48.
Kristine J . Crossen, chair of the Geology Department at the University of Alaska at Fairbanks, points out that there have been periods of major glacial advance even since the Middle Ages, especially during the " Little Ice Age " from 1450 to about 1850.
49.
This is probably a product of the rather small geographic range of the family ( the most limited of any seabird family ), and the periods of glacial advance and retreat that have kept the populations on the move in a narrow band of subarctic ocean.
50.
For while they mark the paths of greatest glacial advance along lowland troughs ( lake basins ), the driftless zone is a district protected from ice invasion by reason of the obstruction which the highlands of northern Wisconsin and Michigan ( part of the Superior upland ) offered to glacial advance.
