...Jeffrey M. Trop; Kenneth D. Ridgway Abstract The lower Cantwell Formation, in the Cantwell basin, provides an excellent opportunity to study the petrofacies and provenance of siliciclastic deposits from an ancient thrust-top basin. The Late Cretaceous Cantwell basin formed on a series of thrust...

...Kenneth D. Ridgway; Jeffrey M. Trop; Arthur R. Sweet Abstract The Cantwell Formation consists of a lower sedimentary sequence as much as 4000 m thick and an upper volcanic sequence with a maximum thickness of 3750 m that was deposited in the Cantwell basin, south-central Alaska. Previous...

... part of the suture zone was development of a thrust-top basin, the Cantwell basin, in the northern part of the suture zone. Geologic mapping and compositional data suggest that the 4 km of Upper Cretaceous nonmarine and marginal marine sedimentary strata in this basin record regional subaerial uplift...

... ( Csejtey et al., 1992 ; Ridgway et al., 2002 ). Coeval with metamorphism of Kahiltna basin strata in the southern part of the suture zone was development of a thrust-top basin, the Cantwell basin, which is presently exposed between the Hines Creek and Denali fault systems. Compositional, detrital...

...Figure 1. Regional map with study area and modern river sample locations annotated. Upper-right inset map shows satellite image location of Figure 1 . We sampled the uplifted Tanana Basin at the Suntrana type section located near Healy, Alaska. Double Mountain (DM) is the location of Cantwell...

.... The geologic age of the upper Cantwell Formation is Paleocene to Eocene with dates of 60–55.5 Ma ( Cole et al. 1999 ). Gilbert et al. (1976) named this upper unit the Teklanika Formation, but the unit name was not accepted by subsequent workers. In the most recent basin-wide study of the stratigraphy...

... a basin formed between Wrangellia and the margin of North America during the accretion of the former ( Ridgway et al., 1997 ). Rocks of the Lower Cantwell Formation are comprised of conglomerates, organic-rich and fossiliferous sandstones, mudstones, and coals. The fluvial setting has been interpreted...

.... 295 , p. 979 – 980 , doi:10.1126/science.1068920 . Ricklefs R.E. Miller G.L. , 2000 , Ecology ( fourth edition ): New York, W.H . Freeman and Company , 822 p. Ridgway K.D. Trop J.M. Sweet A.R. , 1997 , Thrust-top basin formation along a suture zone, Cantwell...

... is Paleocene to Eocene in age with dates of ranging from 60 to 55.5 Ma ( Cole et al., 1999 ). Gilbert et al. (1976) named the upper unit the Teklanika Formation, but subsequent workers have not accepted this designation. In the most recent basin-wide study of the stratigraphy of the Cantwell Formation...

.... Sedimentary deposits of the Colorado Creek basin (TKs in Fig.  2 ) are restricted exclusively to the south side of the McKinley fault and were previously correlated with the lower Cantwell Formation, which is restricted to the north side of the McKinley fault (Kcs in Fig.  2 ; Csejtey et al. 1984 , 1992...