EOCENE BASIN EVOLUTION IN THE NORTH AMERICAN CORDILLERAN HINTERLAND, SOUTHERN BRITISH COLUMBIA
Here we present detailed fluvial stratigraphy from sections in the White Lake, Princeton, and Merritt basins, and a preliminary δDglass value from Princeton fluvial strata. White Lake lithofacies include: 1) planar bounded, broad sheet-like, organic-rich, finely laminated siltstone; 2) planar bounded, wedge shaped, trough cross-bedded sandstone, with interbedded volcanic tuffs; and 3) irregularly-bounded, clast and matrix supported, laterally discontinuous, pebble-boulder conglomerate. Corresponding depositional environments include: 1) floodplain; 2) single-channel fills and dunes; and 3) gravity flows in a meandering fluvial setting. Princeton lithofacies include: 1) concave-up bounded, lenticular sandstone with coal lenses; and 2) planar and concave-up bounded, wedge and lens-like, imbricated, pebble-boulder conglomerate. Depositional environments include: 1) multiple, small, channel fills; and 2) gravity bars in a braided fluvial setting. An ignimbrite sample showed a calculated δ18Oglass value of -18‰ (± 1‰) which is more distilled than the Methner et al. (2016) calculated δ18Owater value of -8‰ in the Chumstick Basin, WA. Merritt lithofacies include: 1) concave-up bounded, lenticular, trough cross-bedded sandstone with interbedded volcanic tuffs; and 2) planar and concave-up bounded, sheet and lens-like, organic-rich, finely laminated siltstone, with minor coal lenses. Corresponding depositional environments include: 1) multiple channel fills; and 2) floodplain deposits in a braided fluvial setting.