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Siltstone is a fine grained clastic rock which may or may not show laminations. Occasionally fossiliferous. This example is from the Carboniferous deposits around Huddersfield, Yorkshire.
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Siltstone is a clastic sedimentary rock. It is primarily composed (>65%) of silt sized particles, defined as grains 2–62 µm. Siltstones differ significantly from sandstones by their smaller pores and higher propensity for containing a significant clay fraction. Although often mistaken as a shale, siltstone lacks the fissility and laminations which are typical of shale. Siltstones are deposited in calm water environments e.g. near the shores of lakes or deep shelf areas. They commonly occur adjacent to sandstone deposits — that is, near beaches and delta edges where sand is deposited. The siltstone will grade into shale in deeper water where the suspended clay particles are more abundantly deposited. This example is from the Carboniferous deposits around Huddersfield, Yorkshire. Specimens are provided with 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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Siltstone microscope slide exhibiting the fine to very fine grained nature of this sedimentary rock. The slides often show concentrated bands of mica which punctuate the dominant quartz mass. Excellent to observe the nature of the minerals and distinguish the history of the rock. The glass slide is 46 x 27 mm in size, suitable for enthusiasts, educational use and more, it will come in card sleeve with a label.
Out of stock
Oolitic limestone from the middle Jurassic of Gloucestershire. Traditional building stone throughout the Cotswolds. Available in a range of sizes.
300 in stock
Lower Carboniferous crinoidal limestone from Derbyshire, U.K.
296 in stock
Dark grey Shale from the Jurassic of the Yorkshire coast. Originally deposited in a deep water marine environment. Occasionally fossiliferous.
190 in stock
Millstone Grit. A coarse grained Carboniferous (Namurian) sandstone from the North of England.
90 in stock
Peat (recent) collected on the moorlands of Lancashire. Supplied in a labelled card tray.
Out of 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
Dolomite or Dolostone is a carbonate rock composed primarily of the mineral Dolomite.
Out of stock
Devonian lower Old Red Desert Sandstone from Gloucestershire available in card trays with a label.
196 in stock
Cretaceous sandstone rock specimens from the Wealden group found in Philpots quarry, west Hoathly, Sussex. This sedimentary rock is formed in estuarine conditions and exhibits quartz and mica crystals, commonly used as a popular building stone.
48 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.
Salt Pseudomorphs on a limy marl matrix collected from the Triassic Aust Cliff in Avon. Numerous cubic imprints can be identified on the limy marl substrate of these specimens; they serve as interesting educational pieces.
20 in stock
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