The Frankenjura is broken naturally into two distinct areas, the northern Frankenjura and the southern Frankenjura. Most of the most famous routes in Germany are within the northern Frankenjura, and when some one speaks about the Frankenjura, it's typically about the northern part. Nevertheless, there have been significant ascents done here (see the video below) and there are lots of quality crags. And something more that the southern Frankenjura offers which the northern Frankenjura doesn't hardly is multipitch.
youtube.com/watch?v=JXmfEju…
The hiking through the Altmühltal is also really pleasant and highly recommended.

The southern Frankenjura is bounded by Burglengenfeld in the north-east, Regensburg in the east, Ingolstadt in the south, and Dollnstein to the west.