File:The standard cyclopedia of modern agriculture and rural economy, by the most distinguished authorities and specialists under the editorship of Professor R. Patrick Wright (1908) (14761998716).jpg

Identifier: cu31924053956946 (find matches)
Title: The standard cyclopedia of modern agriculture and rural economy, by the most distinguished authorities and specialists under the editorship of Professor R. Patrick Wright ..
Year: 1908 (1900s)
Authors: Wright, Robert Patrick, 1857- ed
Subjects: Agriculture
Publisher: London, The Gresham publishing company
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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s System was at first more extended,it has now been restricted by general consentto the following British series:— TT ,-< V. • f4. Tremadoo Stage.Upper Cambrian 13 y^^^ nagg gtage. Middle „ 2. Menevian Series. Lower „ 1. Llanberis and Harlech Series. The rocks of the Longmynd on the Welshborder were formerly regarded as equivalentto the more western Harlech Beds; but they have been relegated since 1885 to the pre-Cambrian systems, through the discovery ofthe Olenellus fauna in higher beds in Shrop-shire. The Harlech Series may also be provedsome day to be pre-Cambrian, since these ancientslates and sandstones have as yet yielded nodefinite fauna. They rise in huge fort-likemasses above the Barmouth estuary and theHarlech coast, and the famous Bwlch DrwsArdudwy, a semicircular notch, afibrds a pass-age through them from the east. The countryhere is scarcely cultivated, though woods gatherin the picturesque valleys towards the sea.The valuable slates of Llanberis and Bethesda
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Harlecharea VTrekin area /^ ton^ ;MalTem .=,.=51. Sketeh-map showing distribution of Cambrian strata in England,Wales, and Ireland, the areas being marked in black similarly form mountain - land east of Car-narvon, and contain remains of Lower Cam-brian trilobites. The Menevian Series occursabove Lower Cambrian strata in the St. Davidsarea, and above the Harlech Series near Bar-mouth. The LiNGULA Flags, a series of slatesand fissile sandstones, with abundant shells ofthe brachiopod now known as Lingulella, forma stretch of moor and upland, with mountainfarms, north of Dolgelly, and occupy the lowerslopes of Cader Idris. They spread north toFfestiniog, and are overlain by the Tremadocslates. The oldest rocks of the English LakeDistrict, the Skiddaw Slates, are probably inlarge part Cambrian. In contrast with the siliceous and argillaceouscharacter of the deposits formed in the Cam-brian sea in southern Britain, the Cambrian ofScotland, known only in the western Highlands,includes the f

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