The Quarterly journal of the Geological Society of London . and small idiomorphic crystals of hornblende. (Betweencrossed nicols, X 8 diameters.) See p. 29. 6. A51. Hornblende-augite-andesite; River Cano (Bolivia); porphyritic crystals of plagioclase (PI)—andesine with Carlsbad twinning,hornblende (Hb) twinned, and showing a resorption - border,and augite (Au) with zonary structure, in a hyalopilitic ground-mass. (Between crossed nicols, X86 diameters.) See p. 25. Plate VIII.(All the figures are of the natural size.) Figs, la & lb. Macrocephalites sp., Callovian; Morro de Arica, Chile. (See p.
The Quarterly journal of the Geological Society of London . and small idiomorphic crystals of hornblende. (Betweencrossed nicols, X 8 diameters.) See p. 29. 6. A51. Hornblende-augite-andesite; River Cano (Bolivia); porphyritic crystals of plagioclase (PI)—andesine with Carlsbad twinning,hornblende (Hb) twinned, and showing a resorption - border,and augite (Au) with zonary structure, in a hyalopilitic ground-mass. (Between crossed nicols, X86 diameters.) See p. 25. Plate VIII.(All the figures are of the natural size.) Figs, la & lb. Macrocephalites sp., Callovian; Morro de Arica, Chile. (See p. 9.)2 a-2 c. Enteletes aff. hemiplicata Hall, Upper Carboniferous ; Arque, Bolivia. (See p. 35.)3a-3c. Seminula ambigua Sow., mut. = jS. peruviana (DOrb.), Upper Carboniferous; Straits of Tiquina, Bolivia. (See p. 32.) Quart. Journ. Geol Soc. Vol. LXX. Pl. I. I n 4 B^^^l flfif *V J / 0 ?i. A r > * ^ -0 P 4 v. * \ % s UJ tr t- DCL O £TU. z UJ UJ </) hlil UJ in <u< << h- hz D0 cX a. O Quart. Journ. Geol. Soc. Vol. LXX,
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