Apparently Woodmorappe is clueless as to the point of a geologic column. Notice I don't refer to "THE GEOLOGIC COLUMN" Each point on the earth has its own geologic history and therefore is its own geologic column.
Why would there be a complete collection of all the eras at any one point? Geology on the earth is an ongoing process of erosion and deposition. Why would there be any point on the earth that was continuously deposited on without significant erosion? That a few points with every era exist is more a matter of winning a lottery.
Just to be clear on a basic idea - THE geologic column is an abstract. We have geologic columns for thousands of points on the earth.
So when we talk about missing portions of the Cambrian era, we mean that at THIS geologic column we have a specific Cambrian layer that is missing from THAT geologic column over there even though both columns have matching layers above and below the missing one.