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).
Otherwise not really sure why the term  Dark ages is no longer deemed appropriate, I think it is or still should be a good term to use, as it was a dark period of time for the people... Source(s): Dark Lord... Â· 8 years ago.