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).
Answer: The Dark Ages are commonly considered to be the early part of the period known as the Middle Ages. Often the term Dark Ages refers to the initial five hundred years following the fall of Rome in 476.