| All three formations pass laterally into the basinal limestones of the Pabdeh formation in the east. |
| It has been interpreted as having been deposited in an offshore, inner basinal to turbiditic basinal environment. |
| The Pico Anticline is part of the Ventura Basin, a large synclinal basinal feature, which essentially encompasses all of the drainage area of the Santa Clara River. |
| The transition from freshwater basinal sedimentation to marine deposition was determined by analysis of diatoms from core samples. |
| When bivalves diversified in the Middle to Upper Ordovician, both classes occupied a full range of environments, from nearshore to basinal. |
| Early Namurian basinal mudstones are the source rocks for these hydrocarbons. |
