Hells Canyon Manuscript & Diagrams


Below you may download a manuscript and a diagram related to the geology of Hells Canyon:

Inundation of Pine Valley (pdf)
Did Bonneville Flood Inundate the Pine Valley Region of Northeastern Oregon?
2013 / 46 pages / click here to download the pdf

Chronostratigraphic Summary (pdf)
Wallowa Arc, Olds Ferry Arc / Baker Terrane / click here to download the pdf

Geologic Time Scale


International ages have not been fully established. These are current names as reported by the International Commission on Stratigraphy.

Walker, J.D., and Geissman, J.W., compilers, 2009, Geologic Time Scale: Geological Society of America, doi: 10.1130/2009.CTS004R2C. ©2009 The Geological Society of America.

Sources for nomenclature and ages are primarily from Gradstein, F., Ogg, J., Smith, A., et al., 2004, A Geologic Time Scale 2004: Cambridge University Press, 589 p.

Modifications to the Triassic after: Furin, S., Preto, N., Rigo, M., Roghi, G., Gianolla, P., Crowley, J.L., and Bowring, S.A., 2006.

High-precision U-Pb zircon age from the Triassic of Italy: Implications for the Triassic time scale and the Carnian origin of calcareous nannoplankton and dinosaurs: Geology, v. 34, p. 1009–1012, doi: 10.1130/G22967A.1; and Kent, D.V., and Olsen, P.E., 2008.

Early Jurassic magnetostratigraphy and paleolatitudes from the Hartford continental rift basin (eastern North America): Testing for polarity bias and abrupt polar wander in association with the central Atlantic magmatic province: Journal of Geophysical Research, v. 113, B06105, doi: 10.1029/2007JB005407.

 Click here to download a pdf version of the table shown below.