00458 –f8fa58082fb79519b8829d1fc892d7

A Graphical Aid for Analyzing Autocorrelated Dynamical Systems 463

Geophysical Weil Log Data

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1115-

FigurÄ™ 24. Sonic log data from a well borÄ™. The horizontal axis is the velocity of sound in rock and the vertical axis is depth. The depth axis corresponds to the time axis in a time series. This data had been declared as uninterpretable.

Offshore Bar Signature

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FigurÄ™ 25. Offshore bar signature extract. The overall shape is elliptical with a "kink" on one side. If the "kink" is large enough it may actually form a single smali loop.