1983, Nicholas Rast,Profiles of Orogenic Belts, page169:
The earliest potassic granites in the southern part of the Timpton-Sutammegablock appear only at the end of the fourth cycle.
2012, Wylie Poag,The Chesapeake Bay Crater:
On the single and two-channel profiles, however, ringing interference (repetition of shallower reflections) between the basement and postimpact sediments prevents clear definition of the displacedmegablocks.
