*** CACHE IS NOT AT THE LISTED COORDINATES ***
BACKGROUND:
German astronomer and geophysicist Alfred Wegener formally proposed the concept of continental drift in 1912. He noticed that the shapes of continents on either side of the Atlantic Ocean seem to fit together (for example, Africa and South America). Francis Bacon, Antonio Snider-Pellegrini, Benjamin Franklin, and others had noted much the same thing earlier. As early as 1900, the similarity of fossils and geological formations led a small number of Southern hemisphere geologists to conjecture that all the continents had once been joined into a supercontinent known as Pangaea. According to this theory, the continents were actually the exposed portions of massive tectonic plates "floating" on the earth's molten core, and had slowly drifted apart over millions of years.
Alfred Wegener
Evidence for continental drift is now extensive, in the form of plant and animal fossils of the same age found around the shorlines of different continents, suggesting that these shores were once joined. For example, the fossils of freshwater crocodiles found in Brazil and South Africa resemble each other closely. Scientists can also point to living evidence, with the same animals being found on two or more continents.
Continents in Motion
The complementary shapes of the facing sides of South America and Africa seem quite obvious, but are only a temporary coincidence, at least in geological timeframes. Over millions of years, the combination of seafloor spreading, continental drift, and other forces of tectonophysics will further separate and rotate the two continents. Yet this "temporary" feature inspired Alfred Wegener to study what he defined as continental drift.
THE CACHE:
In order to locate the cache, you'll need to account for this continental drift. Exactly 880,000 years ago, the ground on which the cache now rests was located at N35° 05.954 W89° 53.429. Ever since, the tectonic plate underlying the cache site has been drifting along at the leisurely pace of exactly one yard per century on a bearing of 300° True. This piece of ground now supports a prominent man-made object, on which you'll find a magnetic keyholder with a logscroll tucked inside. You'd better hurry if you want to locate the cache before it drifts out of reach!
You can check your answers for this puzzle on GeoChecker.com.