Terrace stratigraphy in the Tunica Hills of Louisiana
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
. The other maintains that there are two terraces. The youngest is considered essentially Holocene in age while the older is Sangamon in age. Radiometric and stratigraphic evidence collected for this study indicates that there are two terraces. The youngest
The Savanna Terrace, composed of alternating red and gray clayey sediments of late Wisconsinan age, is the highest glaciofluvial-lacustrine deposit without a loess cover in the upper Mississippi valley. Chemical, physical, and mineralogical data
show that two different sources provided sediment. Radiocarbon dates obtained from the lower Illinois valley indicate that the terrace sediments were deposited sometime between about 13,100 and 9 500 years ago. Soils developed on the terrace
Characteristics of raised cobble ridges in the Terrace Bay area of the north shore of Lake Superior
Amérique du Nord ; Ancien rivage ; Canada ; Cordon de galets ; Galet ; Géographie de l'Amérique ; Géomorphodynamique ; Holocène ; Isostasie ; Lac ; Lake Superior ; Levée de plage ; Littoral ; Ontario ; Quaternaire zones froides ; Terrace Bay
Etude des formations de galets près de Terrace Bay, Ontario. Il s'agit de crêtes de plage soulevée résultant de l'action des vagues. Aucun indice d'action de la glace ou de modifications subaériennes subséquentes. (ALS).
Measurement of abandoned terracing from air photos : Colca Valley, Peru
Almost 61 % of the pre-Hispanic bench terraces built for growing crops in the Colca valley (Department of Arequipa) were no longer in use for agriculture when the air photos were taken in 1974. Yet Peru now imports large quantities of food. - (DWG)
) unit M is the same approximate age as estuarine terrace deposits bordering San Pablo Bay and Carquinez Strait, providing that the terrace deposits have been at diagenetic temperatures 12C warmer than unit M| and (2) the age of unit N is about four times