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Oolitic limestone from the middle Jurassic of Gloucestershire. Traditional building stone throughout the Cotswolds. Available in a range of sizes.
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This Middle Jurassic oolitic limestone is a carbonate rock made up mostly of ooliths (or ooids) which are sand-sized carbonate particles (0.25 -2.0mm) built up of concentric shells of precipitated calcium carbonate CaCO3. These layers were formed around sand grains or shell fragments that were rolled around in lagoons or on a shallow sub tropical sea floor, gathering layers of carbonate. Around the Cotswold Hills, the honey coloured stone has been the favoured building material for centuries & can be seen in many of the local picturesque hamlets. The rock tends to be a little more friable than the example from Yorkshire. Each specimen is supplied in a labelled card tray.
Weight | 120 g |
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Specimen Size | 2" x 2", 3" x 2", 4" x 3" |
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Oolitic limestone thin section slide exhibiting textbook ooid grains, some with a clear nucleus and concentric calcareous layers. These microscope slides supplement the hand specimens nicely and allow for a more detailed view of the ooid grains and an opportunity to intepret the diagenetic history of the rock.
2 in stock
Shelly limestone containing numerous fossil of Carboniferous age, including bivalves , corals, crinoids & brachiopods. These specimens were collected in Gloucestershire, Uk. They are available in a variety of sizes.
Out of stock
Pea Grit (pisolite) is the name given to a Middle Jurassic limestone which is characterised by its large spherical grains or Pisoids, similar to ooliths. Specimens are supplied with a labelled card tray.
6 in stock
Highly fossiliferous reef limestone from the 425 million year old Wenlock Series of the Silurian. Wren’s Nest, Dudley, West Midlands.
30 in stock
Another variation of shelly limestone. This specimen also includes oolites along with fossil shell fragments. The specimens are a pale cream colour and available in card trays with a label.
50 in stock
Peat (recent) collected on the moorlands of Lancashire. Supplied in a labelled card tray.
Out of stock
Portland Limestone: a world famous building stone laid down in the Tithonian stage of the Jurassic. Collected from the Isle of Portland, Dorset. Specimens available in a range of sizes.
Out of stock
Conglomerate with well rounded clasts from Faringdon, UK. A good example of the lithotype as opposed to a Breccia which would contain predominantly angular to sub-angular clasts.
200 in stock
Carboniferous Chert found in Lancashire supplied in a card tray with label.
Out of stock
Chalk is a fine, porous, white form of limestone of Cretaceous age. Formed from the accumulation of coccoliths in a relatively deep marine environment.
299 in stock
Dark grey Graptolitic Shale from Scotland or Cumbria. Contains the delicate blade-like fossils of Graptolites. These were small, colonial marine creatures. Please note that the graptolite content of these specimens is variable.
20 in stock
Purbeck limestone (also known as Purbeck marble) is a fossiliferous carbonate rock found on the Isle of Purbeck in Dorset. UK. Upper Jurassic to Lower Cretaceous in age. Available in a variety of sizes.
200 in stock
Dolomite or Dolostone is a carbonate rock composed primarily of the mineral Dolomite.
Out of stock
A fossiliferous siltstone containing numerous fossil shells of Ordovician (Caradoc) age from the Cheney Longville Flags, Winstanstow, Shropshire. The specimens contain fragments of Orthid Brachiopods, Tentaculites & occasional Trilobite fragments.
Out of stock
Lignite or Brown Coal is a naturally compressed peat deposit. Lower grade than traditional coals & younger in age, in this case from the Miocene in Germany.
98 in stock
Tufa rock specimens which are calcium carbonate rich, sponge-like rock with fossil remains. Believed to be from the Quaternary period, particularly, the Flandrian epoch the specimens come from Caerwys, North Wales. Available in various sizes and supplied in a card tray with labels.
29 in stock
Rhaetic bone bed, Upper Triassic in age. Rich in marine fossils such as bones, scales & teeth from marine reptiles. From Aust Cliff, Gloucestershire.
40 in stock
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