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Chert is classified as a sedimentary rock and is a hard cryptocrystalline form of silica. It is found as nodules and bands within the Cretaceous Chalk, with these samples coming from Norfolk in the UK. It is well known for its glassy crystalline texture which allows pieces to be knapped and for this, the rock was used by stone age humans to make various cutting tools and weapons as it often break, leaving sharp edges. The specimens exhibit an earthy brown colour with a waxy lustre and are available in various sizes, which will come supplied in a card tray with an information label.
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Chert is a hard, cryptocrystalline silica rock of sedimentary origin. It is often to be found as nodules and irregular masses within sedimentary rocks. It is specifically associated with chalk and marl type limestones and it is believed to have formed as a result of large numbers of echinoderms and sea sponges, the bodies of which were highly siliceous, resulting in the chert forming, which chemically is composed of silica . They can be found in variety of colours from dark grey-black, brown, green through to yellow and white. When found in a black colouration, the rock is often instead referred to as ‘flint’. These specimens are however, an earthy brown to yellow colour and show a waxy lustre, often with a white, rough textured outer layer which is usually a layer of chalk. Our examples are from the Cretaceous Chalk beds of Norfolk and are available in three sizes, of which will come supplied in a card tray with an information label.
Weight | 120 g |
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Specimen Size | 2" x 2", 3" x 2", 4" x 3" |
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Specimens of chert found in Foss mine, Scotland, UK. Specimens are supplied in a white card tray with an information label.
15 in stock
Chert, a hard cryptocrystalline silica found as nodules & bands within the Cretaceous Chalk. Supplied by weight in 1 kilo bags.
21 in stock
Specimens of Puddingstone, collected from Hertfordshire, UK. Puddingstone is a variation of conglomerate, which is term used to describe a coarse grained sedimentary rock, featuring large, well rounded clasts in a finer grained matrix. It dates back to the Paleocene to Eocene period around 56 millions years ago. This particular rock is composed almost entirely of silica and has no porosity, likely contributing to its notorious hardness. This rare rock is only found in quantity at one locality in Hertfordshire. As such, it is becoming exceedingly difficult to obtain. This rock is available in multiple sizes and each piece comes supplied in a white card tray with information label.
Specimens of Conglomerate, collected from Farringdon, Berkshire in the UK. Conglomerate is a term used to describe a group of coarse grained sedimentary rocks, featuring large well rounded clasts in a finer grained matrix. They were laid down in a high energy environment, either fluvial, alluvial or shallow marine. The roundness of the clasts can be an indicator of the transport distance or the action of sustained erosion. These specimens are available in multiple sizes and come supplied in a white card tray with an information label.
We also supply Conglomerate thin sections for microscope study which are available to buy HERE.
200 in stock
Specimens of Cannonball Limestone, collected from around the Hartlepool area, in the UK. This is a very distinctive and rare form of limestone known as Cannonball rock. It is part of the Rocker formation; a basin slope deposit which comprises part of the Zechstein Group. This is a highly studied sedimentary formation which dates to the Mid to Late Permian Period. These specimens are small, and come supplied in a 1.5″ x 1.5″ plastic magnifier box with an information label.
5 in stock
Specimens of Rhaetic Bone Bed, collected from the Aust Cliff area in Gloucestershire, UK. The Rhaetic Bone Bed is part of a transgressional formation from the Upper Triassic. It consists of a conglomerate with a calcite cemented sandy matrix, together with an abundance of teeth, scales and bones. These fossils include; coprolites of aquatic reptiles, fish remains of dipnoans and ganoids, scales especially Gyrolepis, ichthyosaur vertebrae, and even bones from the dinosaur Avalonia. Specimens are available in multiple sizes, and come in a white card tray with an information label.
30 in stock
Specimens of Pisolite, collected from Gloucestershire, UK. Pisolites are sedimentary rocks which consist of pisoliths – concretionary grains which resemble ooids, but always more than 2mm in diameter. These pisoliths often consist of calcium carbonate, but can sometimes of rarer minerals too. These grains are approximately spherical and have concentric layers which can reach reach 10 mm in diameter. These examples date to the Mid Jurassic (Aalenian: 177 – 180Ma). Specimens are available in multiple sizes and come in a white card tray with an information label.
We also supply Pisolite thin sections for microscope study which are available to buy HERE.
6 in stock
Specimens of Shelly Limestone, collected from Gloucestershire. This is a fossiliferous limestone from the Carboniferous Period, around 350 million years ago. These specimens are buff to grey in colour and highly compact. It is abundant in various marine fossils, including corals, crinoids, brachiopods and bivalves. The Carboniferous Limestone is the main lithology underlying the Forest of Dean basin & also forms the cliffs of the Wye Valley. Specimens are available in multiple sizes and come supplied in a white card tray with information label.
1 in stock
Specimens of Chalk, collected from Yorkshire, in the UK. Chalk is a soft, white, porous sedimentary carbonate rock and form of limestone. It forms in reasonably deep marine conditions, by the gradual accumulation of minute calcite plates, known as coccoliths, which shed from micro-organisms called coccolithophores. Additionally, it is not uncommon to find flint or chert nodules embedded in chalk. These specimens are Cretaceous in age, available in multiple sizes, and supplied in a white card tray with information label.
We also supply Chalk thin sections for microscope study which are available to buy HERE.
266 in stock
Specimens of Sandstone, collected from Philpots Quarry, West Sussex, in the UK. This sandstone is from the Wealden Group (Hastings sub-group), which dates it to the Lower Cretaceous. This makes these rocks approximately 110 million years old. This Cretaceous sandstone is yellow to buff in coloured, and particularly fine grained. It exhibits large scale cross bedding, which is indicative of fast flowing tidal currents. It is quite soft , friable and flaggy in places and so is extracted mainly for concreting and building sand. These specimens are available in multiple sizes and come supplied in a white card tray with information label.
We also supply Cretaceous Sandstone thin sections for microscope study which are available to buy HERE.
43 in stock
Specimens of Aeolian Sandstone collected from Lazonby, near Penrith, Cumbria in the UK. This aeolian sandstone is Triassic in age – approximately 200 Ma. It belongs to the group of rocks known as the New Red Sandstone which date from the Permian (280 Ma) into the Triassic. The composition of this sandstone consists solely of spheroidal (millet seed) quartz grains with an iron oxide cement called haematite. It is the presence of this haematite that contributes to the distinct red – orange colouration of these samples. This lithology is typical of an aeolian (wind blown) hot desert environment. Available in multiple sizes, these specimens come supplied in a white card tray with information label.
We also supply Aeolian Sandstone thin sections for microscope study which are available to buy HERE.
Magnesian Limestone. A dolomite rich rock from the Permian formations of North Yorkshire.
We also supply Magnesian Limestone thin sections for microscope study which are available to buy HERE.
Out of stock
Specimens of Old Red Sandstone, collected from Gloucestershire in the UK. The Old Red Sandstone describes a suite of sedimentary rocks deposited in a variety of environments primarily during the Devonian period, but also extending back to the late Silurian, and on into the earliest parts of the Carboniferous. Alluvial sediments and conglomerates dominate at its base, then progresses to a combination of aeolian, lakes and river sediments. The familiar red colour of the rocks from the presence of Iron Oxide. These specimens are Lower Devonian in age, fine grained and pinkish red in colour. Available in multiple sizes, they come supplied in a white card tray with information label.
We also supply Old Red Sandstone thin sections for microscope study which are available to buy HERE.
174 in stock
Portland Stone is a variation of limestone which formed during the Tithonian stage of the Jurassic period. It has been quarried since the 14th century, notably on the Isle of Portland, Dorset. This pale rock is sufficiently hard to resist weathering but yet soft enough to carve hence it makes an ideal architectural material. It was famously used for the construction of St. Pauls Cathedral and Buckingham Palace in London. Like most limestone, Portland stone formed in sub-tropical seas where wave action even resulted in the micro oolites visible in some pieces. Specimens are supplied in a labelled card tray.
We also supply Portland Limestone thin sections for microscope study which are available to buy HERE.
Out of stock
Specimens of Crinoidal Limestone, collected from Derbyshire in the UK. Limestone is a common, well known sedimentary rock. It consists of the calcium-rich shells, bones, and skeletons of the fauna that dominated during that period. It was laid down approximately 350 million years ago in semi tropical seas and comes from the Dinantian epoch of the Lower Carboniferous. This limestone in particular contains crinoids which are a group of ancient marine invertebrates, and part of the sea lily family. Specimens are available in various sizes and come supplied in a white card tray with information label.
We also supply Crinoidal Limestone thin sections for microscope study which are available to buy HERE.
288 in stock
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