Evaluation of paleo-wave conditions from oscillatory structures preserved in cretaceous sediments of Baja California
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Abstract
Measurements were obtained of spacing (E), dip and height of oscillatory ripples (hum- mochyylswaley cross-stratification) preserved within the sections of Punta Banda and Peñasco La Lobera in the Late Cretaceous Rosario Formation, in Baja California. From these data we estimated the hydrodynamic characteristics of paleo-waves that produced the oscillation ripples: near-bottom orbital diameter of the wave motion (do), near-bottom orbital velocity (Um), wave period (T) and wave height (H). A clear dependence is shown through the use of ripple spacing and five equations to obtain these paleo-wave parameters. The localities studied represent the higher limit (Peñasco La Lobera) and lower limit (Punta Banda) of the shoreface.
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