Threshold response of small streams to surface coal minig, bitumous coal fields, central Pennsylvania
Stream response to surface coal mining and reclamation was studied in 29 small watersheds located in the bituminous coal fields of Central Pennsylvania. Observed differences in channel morphology were related to differences in extent of mining
by means of scatter plots, correlation, cluster analysis and bivariate regression. For streams that have exceeded threshold levels, disequilibrium is demonstrated by a strong, positive correlation between local stream slope and basin area.
Stream water quality in a mountain recreation area
Surface waters in and near the Indian Peaks Wilderness area in Colorado, USA vary seasonally and locationally in chemical and biological constituents. The level of inorganic nutrients depends on stream flow. - (DWG)
Suggestive essay that discusses human preferences in mountain landscapes : light-colored granite rock| timberline and alpine meadow vegetation| water (tarns, streams, waterfalls)| snowcaps| ice-sculpted features| interconnected ridges. The Alps
The age and number of important fossil-producing late Pleistocene terraces in the Tunica Hills have recently become quite controversial. One hypothesis holds that only a single loess-mantled Farmdalian terrace flanks the streams in this area
marble lowland gravel horizons and distribution of stream gradients and floodplains indicate that erosion in the Maryland piedmont has not been uniform over long periods. The upland surface of low relief in the present piedmont landscape appears
Deux glaciations au moins sont enregistrées dans la stratigraphie du till dans le sud du Maine. Un till inférieur, profond et altéré est mis en corrélation avec le Nash Stream Till du Wisconsinien inférieur, au New Hampshire et avec ses équivalents
by the development of ice-marginal streams and proglacial lakes that drained southward during initial retreat, but northward during late Vashon time. Relatively rapid retreat of the Juan de Fuca lobe may have contributed to partial stagnation of the northwestern part
and abundant plant macrofossils. Coleoptera were represented by 24 families. Several major beetle groups indicate a riffle-and-pool stream, surrounded by marsh, with open riparian habitats and nearby trees. Two zones were recognized. The Zone 1 fauna (ca