![]() ![]() This locality is well worth a visit.Co-researcher Dr Bob Burne from ANU said the new study found that ooids were made of concentric layers of mineralised microbes, debunking the popular ‘snowball theory’ that ooids were formed by grains rolling on the seafloor and accumulating layers of sediment. Forest Enterprise are keen to conserve the section as a clean exposure and place it on their list of Forestry Important Geological Sites. This outcrop forms probably the most complete inland stratigraphic section of this part of the Corallian sequence. Very fine-grained flaggy sandstone with Thalassinoides burrows Cardioceras (Vertebriceras) sp., Goliathiceras sp., and Aspidoceras sp. Chlamys fibrosa, Opis corallina, Isocyprina sp., Rhynchonelliodea sp., Glyphea sp. erosion surface, subdivisions 2 and 3 missing -įine-grained quartz sand with, at the base, concretions of fine-grained fossiliferous sandy limestone with abundant Nanogyra nana also Meleagrinella sp. Thamnasteria sp., Rhabdophyllia phillipsi, Chlamys fibrosa and Pentacrintes sp. Yedmandale Member (formerly Passage Beds)įine to medium-grained shelly calcareous sandstone and sandy limestone with coral fragments. Poorly sorted fine-grained oosparite with burrows into the top of the Yedmandale Member. Since the fire on the Moor in September 2003 moorland grasses are now re-established over most of the area, yet on the ganister outcrop grasses are sparse and a complex of heather, bilberry, sedges and mosses form the vegetation. ![]() On the outcrop are large blocks and broken pieces of ganister which appear to have been collected and broken up before transportation. On Stony Marl Moor outcrops of ganister are located near Stony Marl Howes ( NZ 957007). The best ganister lies at the base of the Moor Grit. As with the ganister of the Carboniferous coal measures the ganister of Stony Marl Moor was formed from seat earths in which Middle Jurassic plants grew to form the coal seams of the Long Nab Member deposits. ![]() Used for furnace linings.”Īt the beginning of the last century Ganister was won on a commercial basis from Stony Marl Moor ( NZ9500). It consists almost entirely of silica, and its freedom from fluxing constituents such as iron and magnesium makes it refractory at high temperatures. Ganister is described by Borner (1962) as “A fine grained compact siliceous sandstone, usually pale grey in colour, occurring in Carboniferous strata as the seat earth of some coal seams. The depositional history of the Hackness Coral-Sponge Bed and its associated sediments within the Passage Beds Member of the Coralline Oolite Formation (Corallian Group Oxfordian) of north Yorkshire. The stratigraphy of the Yorkshire Corallian. Permission from the Wykeham Gun Club is required for entrance into this quarry. The overlying Middle Calcareous Grit presents as 3m of calcareous sandstone with many traces of leached fossils. Above the bentonite it is a massively bedded cream-grey sparsely fossiliferous oolitic limestone. Below this clay parting it is richly fossiliferous with Pseudomelania heddingtonensis, Nanogyra sp., Chlamys fibrosa, Gervillella acuta, Camptonectes sp. The Hambleton Oolite contains a persistent thin parting of bentonite clay. The sequence exposed lies entirely within the Coralline Oolite Formation (Lower to Middle Oxfordian) and shows admirably the boundary between the Hambleton Oolite and the overlying Middle Calcareous Grit. This large quarry has faces totalling about 350m in length and from 10-15m high. Wykeham Quarry, situated adjacent to Rushton Lane ( SE 959845), is currently used by a gun club as a shooting range. ![]()
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