Having made my first acquaintance with that puzzling series of strata which bridges over the vast interval of geologic time between the Carboniferous and the Jurassic in the Nottingham district during a residence of eight years in the good old town (see Proc. Geol. Assoc. vol. iv.; also Quart. Journ. Geol. Soc, November, 1875), the meeting at Nottingham seems a fitting occasion for summarizing the results of further work in connection with those rocks, as opportunities have offered, during the last twenty years.