I. Concretionary with Calcareous Cement.—Last autumn the Rev. John Adams, of Stockcross, kindly took me to see the interesting specimen of Sarsden Stone in situ at Langley Park, north of Newbury, Berks, which he described in the “Transact. Newbury District Field Club,” vol. i. 1871, p. 107, and in the Geol. Mag. Vol. X. p. 200; and which has also been described by Mr. W. Whitaker in the “Memoirs Geol. Survey,” vol. iv. p. 193. This concretionary Sarsden Stone, belonging to the “Woolwich and Reading” series, consists of quartz grains with a Calcareous cement. This is an unusual circumstance for “Sarsden Stone”; and points to the former presence of Shells, perhaps, or of calciferous waters, in that portion of the Lower Eocene series.