Note that the Orientation Slice is cut precisely to the (100) before the crystal is rotated and cut at either +.25 degrees and toward the flat, or â.25 degrees and away from the flat (as described in Figure 3).
The era was called the Dark Ages also because we don't have a lot of written sources from that time period, especially from the early part of the dark ages (500 to 800 CE).
It seems clear, however, that after what is known as the Greek Dark Ages (approximately 1100-800 BCE, so named because of the absence of written documentation) the Greeks further colonized much of Asia Minor, and the islands surrounding mainland Greece and began to make significant cultural advances.