| Abstract: | Sea-floor drainage features of Cascadia Basin and the adjacent continental slope include canyons, primary fan valleys, deep-sea valleys, and remnant valley segments. Long-range sidescan sonographs and associated seismic-reflection profiles indicate that the canyons may originate along a mid-slope escarpment and grow upslope by mass wasting and downslope by valley erosion or aggradation. Most canyons are partly filled with sediment, and Quillayute Canyon is almost completely filled. Under normal growth conditions, the larger canyons connect with primary fan valleys or deep-sea valleys in Cascadia Basin, but development of accretionary ridges blocks or re-routes most canyons, forcing abandonment of the associated valleys in the basin. Astoria Fan has a primary fan valley that connects with Astoria Canyon at the fan apex. The fan valley is bordered by parallel levees on the upper fan but becomes obscure on the lower fan, where a few valley segments appear on the sonographs. Apparently, Nitinat Fan does not presently have a primary fan valley; none of the numerous valleys on the fan connect with a canyon. The Willapa-Cascadia-Vancouver-Juan de Fuca deep-sea valley system bypasses the submarine fans and includes deeply incised valleys to broad shallow swales, as well as within-valley terraces and hanging-valley confluences. ?? 1989. |
| Genre: | Article |
| ProdID: | 70015586 |
| Citation Author: | Hampton, M. A.; Karl, H. A.; Kenyon, N. H. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 272 |
| Citation Issue: | 2-4 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Marine Geology |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 24 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Sea-floor drainage features of Cascadia Basin and the adjacent continental slope, northeast Pacific Ocean; 1989; Article; Journal; Marine Geology; Hampton, M. A.; Karl, H. A.; Kenyon, N. H. |
| Citation Start Page: | 249 |
| Citation Volume: | 87 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Sea-floor drainage features of Cascadia Basin and the adjacent continental slope, northeast Pacific Ocean; 1989; Article; Journal; Marine Geology; Hampton, M. A.; Karl, H. A.; Kenyon, N. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
| Publisher: | |
