. The geology of the Oamaru district, North Otago (Eastern Otago division). ir relationship to one another. The upper glauconitic limestone is followed by a bed of hard grey semi-crystallinelimestone, varying from 16 in. to 30 in. thick. Overlying this bed is a deposit ofglauconitic greensands crowded with molluscs, brachiopods, and Polyzoa. The greensandsare about 14 ft. thick. They are overlain by a bed of hard dark yellowish-browncalcareous sandstone, also containing molluscs and beds represented in this valley are thus— ((g) Hard brown glauconitic sandstone ; thickness, 6 f
. The geology of the Oamaru district, North Otago (Eastern Otago division). ir relationship to one another. The upper glauconitic limestone is followed by a bed of hard grey semi-crystallinelimestone, varying from 16 in. to 30 in. thick. Overlying this bed is a deposit ofglauconitic greensands crowded with molluscs, brachiopods, and Polyzoa. The greensandsare about 14 ft. thick. They are overlain by a bed of hard dark yellowish-browncalcareous sandstone, also containing molluscs and beds represented in this valley are thus— ((g) Hard brown glauconitic sandstone ; thickness, 6 ft. exposed ; (/) Glauconitic greensands, 14 ft; fossiliferous.(e) Hard grey semi-crystalline limestone, 16 in. to 30 in.(f/) Glauconitic limestone (Upper Oamaru stone), 50 ft. thick : (c) Tachylitic mineral breccia, calcareous.[(b) Glauconitic limestone (Lower Oamaru stone).(a) Dark greenish-brown transverse section across the mouth of the gully near the county road isshown in Fig. 15. of Hutch insonian Ototaran Waiarekan. O /ttIi I I I . I I m I I I I n |- FiG. 15.—Teansveese Section at .Mouth of West Beanch of Landon Oeeek. a. Upper band of Oamaru stone, 24 ft. showng. h. Bed of hard semi-crystalline limestone. c. Glauconitic greensands, crowded with Pachymagasparki (Hutt.). d. Hard brown calcareous sandstone, thickness of6 ft. exposed, with Pecten huttoni (Park)(abundant), Meoma crawfordi Hutton {—Peri-cosmiis compressus McCoy), &c. e. High-level Pleistocene gravels. From the upper portion of bed a, Fig. 14, were obtained the molluscs Epitonium lyraiwn (Zitt.), Pecten delicatulus Hutt., P. polymorphoides Zitt., and Ostrea sp. Fromthis bed Uttley records the following brachiopods :— Liothyrella boehmi Thomson. Hemithyris squamosa (?) (Hutt.). Liothyrella landonensis Thomson. Pachymagas ellipticus Thomson. Mtheia gaulteri (Morris). Rhizothyris rhizoida (Hutt.). TerebratuUna suessi (Hutt.). 47 From the greensands bed c, Fi
Size: 2314px × 1080px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1918
