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Our transcription: By understanding how mud cracks, ripple marks, cross-bedding, and other sedimentary structures and textures form, geologists can, in a sense, read the sedimentary rock record. This allows them to reconstruct the physical appearance of ancient landscapes. One place such work is being done is known as the "Ridge Basin," a thick sequence of sedimentary rocks sandwiched between the San Andreas and San Gabriel faults in Southern California. Today, this area is not a basin at all; it is instead part of a young growing mountain range. Yet 5 to 10 million years ago it was a deep depression.
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