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| Keywords: The Quarterly journal of the Geological Society of London (14076895834).jpg 270 <br> CAPT P W HUTTOI ON THE GEOLOGICAL POSITIOJf <br> yellow or whitish arenaceous limestone with scattered green grains <br> which get more abundant near the base but are never sufficiently nume- <br> rous to give it a green colour The exposed surface is honeycombed <br> thus strongly contrasting with that of the Amuri limestone A close <br> inspection shows that the upper surface of the Amuri limestone is <br> much broken and fissured the Weka-pass Stone penetrating into <br> the fissures for a distance of one or two feet with an abrupt division <br> between the two rocks Also rounded pebbles of the Amuri lime- <br> stone are found in the Weka-pass Stone within six inches of the <br> junction but not higher These pebbles are not concretions as has <br> been supposed for they are exactly similar in composition and <br> structure to the Amuri limestone on which the ' lie and are quite <br> different in appearance from the concretions found in the green <br> sandstones underlying the Amuri limestone Evidently we have a <br> waterworn surface and therefore as the nature of the upper <br> rock excludes the idea of chemical erosion we have an uncon- <br> formity In addition to this the Weka-pass Stone overlaps the <br> Arauri limestone to the north and rests on the slate rocks of Mt <br> Alexander at Hurinui ; and as neither rock is a shallow water <br> deposit and as the Amuri limestone extends far north of the <br> Hurinui this overlap is another proof of unconformity Over- <br> lapping is also seen in other places as mentioned in mj' report pre- <br> viously alluded to <br> Motunau River � I have not examined this section myself but <br> Mr M'Kay says that near the north-east part of Mt Cass range <br> there is a syncline in which the Grey Marl is seen overlying the <br> Amuri limestone fig 3 On the west side of this syncline the <br> Fig 3 � Section across the Soutli Branch of Motunau Creeh <br> after M'Kay <br> For explanation see fig 1 <br> Grey Marl containing here Pecten Zittelli rests unconformably on <br> the lower beds of the Waipara System while it passes upwards <br> into the Mount-Brown bedsf Nevertheless Mr M'Kay thinks <br> that this apparent relation of the Grey Marl to the Mount-Brown <br> beds is not real because more to the north-east the Grey Marl is <br> interbedded with the upper portion of the Amuri limestone J ; <br> Pecten Zittelli Huttou is the same as the Pecten belonging to the group <br> Pleuronectes in the palaeontology of the voyage of the ' Novara ' pi ix f 3 <br> t ' Geological Eeports ' 1879-80 p 1 13 <br> \ His section however shows the Grey marl as unconformable on the Amuri <br> limestone as well as on the older Waipara beds see fig 3 and at 3a the <br> Amuri limestone is unconformable on the Waipara beds 37047126 114009 51125 Page 270 Text 41 http //www biodiversitylibrary org/page/37047126 1885 Geological Society of London NameFound Pecten NameConfirmed Pecten EOLID 10719936 NameBankID 2692292 NameFound Pleuronectes NameConfirmed Pleuronectes EOLID 24839 NameBankID 2486124 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047126 dc identifier http //biodiversitylibrary org/page/37047126 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/14076895834 2015-08-26 04 53 31 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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