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).
The Greek Dark Age is the interval between the collapse of the Mycenaean civilization, around 1200 BCE, and the Greek Archaic Period, around c. 800 BCE. The Dark Age era begins with a catastrophic event: the collapse of the Mycenaean civilization, when all major Mycenaean regional centres fell out of use after suffering a combination of destruction and abandonment.