Note 223 — Chapter XXXVI · THE PLATEAUX
Reading edition
Professor J. D. Dana, originally an advocate of infiltration from above, subsequently supported the view that the kernels of amygdaloids were filled in by the action of moisture within the rocks during the time of cooling.—Amer. Journ. Sci. ser. 3, vol. xx. (1880), p. 331. Messrs. Harker and Marr have demonstrated that the Lower Silurian vesicular lavas of the Lake district had already become amygdaloids before the uprise of the Shap granite.—Quart. Journ. Geol. Soc. vol. xlix. (1893).