1 of 5000

|

toddler t-shirts prehistoric toddler t-shirts grand canyon national park toddler t-shirts grand canyon toddler t-shirts geology toddler t-shirts geophysical toddler t-shirts geological toddler t-shirts geologic record toddler t-shirts prehistory toddler t-shirts history toddler t-shirts historic toddler t-shirts historical toddler t-shirts schist toddler t-shirts metamorphic rock toddler t-shirts unconformity toddler t-shirts erosional toddler t-shirts

photographs prehistoric photos grand canyon national park photos grand canyon photos geology photos geophysical photos geological photos geologic record photos prehistory photos history photos historic photos historical photos schist photos metamorphic rock photos unconformity photos erosional photos

Add This Artwork to Your Favorites Collection

Comment

Add This Artwork to Your Favorites Collection

Comment

Grand Canyon National Park, Arizona. Section in the north wall of the Grand Canyon illustrating the unconformity between (A) lower Precambrian schists and (B) steeply dipping upper Precambrian beds and the unconformity between (B) upper Precambrian and (C) Paleozoic strata. Precambrian pertains to the earliest era of earth history, ending 570 million years ago, during which the earth's crust formed and life first appeared in the seas. An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval of time before deposition of the younger, but the term is used to describe any break in the sedimentary geologic record. This image has been color enhanced.