Laboratory eight dating of rocks fossils and geologic events usan sexsite
A bed marks an episode and an environment (facies) of deposition.
The contacts between the beds mark hiatus (a gap) representing either a time of non-depostion or erosion.
This -2- has been stripped bare along the modern beach, but is capped by older uplifted beach deposits of 125,000 year age from the penultimate sea level high-stand.
Here the 2 sedimentary layers not only happened at very different times, but in different facies or environments.
___________________________ ________________________________________________________________________ _______________________________________________________________________ (2) C.2 Ink in the Angular unconformity on the photo above in Red and measure the angle between the unconformity (horizontal) and the left dipping diatomite beds .Every fossil is a time capsule containing a record of events that happened on Earth thousands or millions of years ago.Michelle cleans and prepares fossils to better expose them for study and display.The rocks below are deformed igneous and metamorphic that are hundreds of millions to billions of years older than the overlying sedimentary succession.This requires uplift and erosion on land of much of the upper continental crust.
This is close to the San Andreas Fault where the Pacific Plate is dragging the edge of North America to the Northwest (recall lab 2.7 on p.66 & 67). Examine the photo, that on p.218 and Figures 8.4 & 8.5 p.210.