Fossilised ripple marks. Cyclic and rhythmic aeolian stratification in a slab of sandstone. Small-scale, fossil ripple structures in a slab of sandstone. Here the ripple marks stand out clearly due to the varying grain size and the iron content of the very thin, wind-deposited layers. Specimen from the Jurassic Navajo formation, southern Utah state, USA.

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TOP07423488

Source:

達志影像

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RM

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須由TPG 完整授權

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