notes from tobr Janesville A number of extensive quarries and natural exposures are to be found here. At a quarry 1/2 mile west of the city is a large quarry. The basal layers are not very fossiliferous. Above these lie layers "eminently fossilif- erous". At the lower R.R. bridge at Janesville the whole of the Lower Buff is shown, resting on the St. Peters, and overlaid by 30' of the higher beds. These beds are here less fossiliferous than usual. About two miles above the city Rock River cuts through the lower part of the formation and into the St. Peters, and a ravine coming in on the east, through which the road