CLASSIFIED Subgroup A. Tufa. TABLEUNIVERS." 15 Var. a. Trachyte. c. Phonolyte. B. Peperino. Var. a. Augyte. c. Palagonyte. C. Volcanic conglomerate. b. Volcanic agglomerate. Class IV.-TRANSITION OR METAMORPHIC SEDIMENTARY ROCKS. Group L.-GNEISS. Subgroup A. Felspathic and felsitic gneiss. Var. a. Orthoclase gneiss. b. Oligoclase gneiss. e. Alpinyte. d. Adularia gneiss. B. Micaceous gneiss. Var. a. Two-mica gneiss. C. Quartzitic gneiss. D. Basic gneiss. Var. a. Hornblendic gneiss. c. Talcose gneiss. E. Iolitic gneiss. F. Hematitic gneiss. H. Common gneiss. Var. a. Compact gneiss. Var. c. Ribaned gneiss. Subgroup I. Oblique gneiss. Var. a. Curled gneiss. c. Conglomeritic gneiss. J. Porphyritic gneiss. Var. h. Epidotic. k. Calcareous. r. Ribaned. s. Fibrous. t. Nummoid. u. Wavy. x. Knotty. z. Gneissoid. Subgroup E. Basic schist. Var. a. Hornblende schist. b. Actinolite. c. Chlorite. d. Chloritoid. e. Potstone. f. Talc schist. g. Garnet. h. Tourmaline. i. Rhætizitic. F. Metallic schists. Var. a. Mico-iron schist. c. Pyrrhotite schist. G. Burnt shale. Var. a. Burnt clay. b. Rock slag. c. Porcelanyte. H. Minerals forming rock masses (see page 22). Var. a. Quartz. b. Corundum. c. Apatite. Var. e. Orthoclase. 1. Graphite. n. Garnet-rock. Group N.-SLATE. [See Order II., Class I., Group A, Subgroup B, Variety d.] Group O.-CALCAREOUS ROCKS. Subgroup A. Schistose limestone. Var. a. Cipollino. c. Hemitrene. f. Granular schistose limestone. Group P.-PSEUDOMORPH CALCAREOUS ROCKS. Subgroup A. Schistose dolomyte. Var. a. Micaceous dolomyte. B. Ophyte. b. Pyritous. c. Saccharoid. d. Granular. Var. a. Ophidolomyte. C. Steatyte. Var. a. Felsitic steatyte. b. Hornblendic. c. Pyroxenic. d. Micaceous. f. Pyrallolyte. D. Magnesyte. E. Smaragdite schist. Order No. II.—DERIVATE ROCKS. (Divided into Classes, Groups, Subgroups, Varieties, and Subvarieties.) Class I.-SUBAQUEOUS ROCKS. Group A.-ROCKS FOR THE MOST PART MECHANICALLY FORMED. Subgroup 4. Arenaceous rocks. Var. a. Sand, gravel, and shingle. b. Conglomerate. Subvar. a. Calcareous. Subvar. a. Calcareous. b. Hematitic. c. Cupriferous. d. Sandstone and grit. Subvar. a. Calcareous. b. Argillous. c. Felspathic. f. Cupriferous. 1. Concretionary. p. Friable. |