When geologists make field observations, they typically focus on the rock before them and its color, density, mineral makeup, fossil content, and other features. But they often would be well-served by looking at the strata’s context as well.
Numerous examinations of local outcrops can result in large-scale maps and cross-sections. Both small-scale and large-scale studies are necessary, but big-picture consideration of the strata and timing of deposition produces some interesting observations that help to explain both the rock and the conditions under which it was formed.
Geologists have found that the layers come in “packages” of strata called megasequences that are bounded on top and bottom by evidence of erosion. The depositional package of sediments overlies a recognizable unconformity or erosional plane and is truncated at the top by another unconformity. Geologists identify at least six megasequences that together comprise essentially all sedimentation. The packages persist across the continents, often ignoring the standard geologic column, yet fitting in with the megasequences. Nearly all sediments were either water-deposited or water-eroded. Could this be the signature of the global Flood?…
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