Tephra layers near Glacier Peak in the North Cascade Range provide limiting dates for four periods of alpine glacier advance. Field relations suggest that late Wisconsin alpine glaciers last advanced prior to the eruption of tephra layers from
Glacier Peak about 11.250 yr B.P. Late Wisconsin deglaciation in the central North Cascades was complete prior to the Glacier Peak tephra eruptions. Glaciers again expanded in the early Holocene about 8400-8300 yr B.P. Soil formed in alpine meadows during
an episode of mild climate in the middle Holocene prior to at least two intervals of glacier expansion: an older episode between 5100 and 3400 yr B.P., and a younger episode within the last 1000 yr.
Farm layouts and building styles of the metis agriculturalists in Central Saskatchewan prior to 1870 manifested technology imported from francophone communities along the St. Lawrence River. The AA. contend that the metis house and farmstead
Flood frequencies comparable to those of the twentieth century existed prior to 1020 A.D. and after 1390 A.D. Large floods were three to four times more common during the intervening centuries. Climatic conditions are the most probable factors
A profile 1,56 m thick within the Bahia Blanca estuary has been studied using microfaunistic and isotopic methods. The deposition took place over Upper Pleistocene consolidated sediments and begins prior 6 000 y. B.P. Hypsithermal was found near 6