File:The Quarterly journal of the Geological Society of London (1898) (14592537128).jpg

Identifier: quarterlyjourna541898geol (find matches)
Title: The Quarterly journal of the Geological Society of London
Year: 1845 (1840s)
Authors: Geological Society of London
Subjects: Geology
Publisher: London (etc.)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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such exposure being seen again.Mr. Beasley found the following fossils in the excavation :—Belle-rophon sp., Productus Cora^ Spirifera glabra, and Lepidodendron (?),and they were submitted to me for determination. In a Guide toLlandudno, by John Heywood (undated), it is stated that In anold quarry, once a sea-beach, at the foot of Great Orme, nearChurch Walks, Stigmaria and Lepidodendron may be found in situ/and this no doubt relates to the same exposure. The Lower Brown Limestone or Dolomite is the lowest subdivisionat Great Ormes Head. It is well exposed in the precipitous cliffsabove Llandudno, on the road above the Pavilion to the HappyYaUey, and at the Flagstaff 100 yards north of the Lodge. The rockvaries from a coarse to a fine-grained dolomite, which in many placessimulates a mass of coral, and there are frequent drusy cavities con-taining crystals of pearlspar. It closely resembles the Permianlimestone of Sunderland, and is of the same massive and crystallinecharacter. 2e2
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Vol, 54.) CARBONIFEROUS LIMESTONE NEAR LLAKDTJDNG. 387 The following analysis was kindly made for me by Mr. H. Eairrieat Dr. George Tates College of Chemistry, Liverpool:— Per cent. Lime 2778 Magnesia 22-83 Iron protoxide (FeO) 48 Iron sesquioside (FcoOg) *59 Silica . -40 Water j69 Carbon dioxide 47*23 10000 From the above the percentage of the carbonates is seen to be :— Carbonate of lime 4960 „ magnesia 4795 The original bedding is preserved, but there is little or no shalebetween the beds. Fossils seldom occur, and then only in theupper surface of the beds, but at the bottom of the wooden stepsdown to the beach, just beyond the Pier, are two or three beds oflimestone, interstratified with the dolomite, containing Syringoporaramulosa and the stems of encrinites. These are some of thelowest visible beds, and they dip 25° W.N.W., but those describedas occurring at Chapel Walks must be under them. On the highground above the Happy Valley the dip is 18° W., and on the OldRoad, n

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