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Puddingstone conglomerate is a rare sedimentary rock from Hertfordshire, UK which formed during the Paleocene to Eocene period. Composed of rounded flint clasts within a silica matrix, this rock is quite hard and breaks with conchoidal fractures. Formed through erosion of flint pebbles which were later cemented by sand and silica, it is an excellent representation of conglomerate, detailing rounded clasts within a matrix. The specimens are available in 4 sizes and come supplied in a card tray with a label.
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Puddingstone is a variety of conglomerate found in Hertfordshire, UK which formed during the Paleocene to Eocene period around 56 millions years ago. A sedimentary rock, these specimens are excellent examples of conglomerate, detailing textbook features such as a fine matrix with well rounded clasts. This particular rock is composed almost entirely of silica and has no porosity, likely resulting in its notorious hard state. It is theorised that this puddingstone began formation during the early Paleocene when rapid erosion of chalk beds occurred leading to a huge amount of flint being deposited into the proto-North Sea. Over the years, wave action resulted in the flint becoming smooth and rounded, almost ovoid in shape and deposited during the late Paleocene 56 million years ago as shingle/cobble beaches. As percolation of silica-rich water began just below the ground, sand began to be deposited between the flint pebbles holding them in place, the sand later was also infilled by crystalline silica to make a nearly pure silicate rock with a hard form. Due to this, puddingstone is different among conglomerates as it formed through wave action and percolation of ground water as opposed to erosion and cementing through material carried by a river. Due to the silica rich nature of the rock, puddingstone conglomerate has a natural shine to it, as if it has been polished and care should be taken when handled as specimens may contain sharp edges. This rare rock is only found in quantity at one locality in Hertfordshire and as such is becoming exceedingly hard to obtain. We can supply this rock in 4 sizes and each piece will come supplied in a card tray with a label.
Weight | 120 g |
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Specimen Size | 1.5 " x 1.5", 2" x 2", 3" x 2", 4" x 3" |
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Milllstone Grit is a fine- to very coarse-grained feldspathic sandstones, interbedded with grey siltstones and mudstones, with subordinate marine shaly mudstone, claystone, coals and seatearths. It is Carboniferous ( Namurian) in age & laid down in estuarine to tidal environments. Millstone Grit forms many prominent features throughout the north of England. It’s well cemented structure has made it an ideal building stone for the characteristic terrace cottages & mills of the area prior to the mass use of bricks. As the name implies, it was the preferred lithology to make millstones. This example was collected near Horwich, Bolton. Specimens are supplied in labelled card trays. it can also be purchased by weight in 1kg bags.
90 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
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. These specimens may also contain some shell fragments. Each specimen is supplied in a labelled card tray.
300 in 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.
Lignite, often referred to as Brown Coal is a soft combustible sedimentary rock form by the natural compression of peat material. It has a high carbon content 25 – 35% & a moisture content up to 66%. The high volatile matter content makes it easier to convert into gas and liquid petroleum products than higher ranking coals. Unfortunately its high moisture content and susceptibility to spontaneous combustion can cause problems in transportation and storage. It is used almost exclusively for the generation of electricity in countries such as Greece & China. Germanium is extracted from lignite mined in China. This example is from Miocene deposits in Germany. Specimens are supplied in labelled card trays.
91 in stock
This is a rare & unusual rock, part of the highly studied Zechstein Formation. It is a concretionary Magnesium Limestone of Permian age, supplied in a 1.5″ x 1.5″ magnification box.
10 in stock
Specimens of fault breccia found in Great Langdale, Cumbria, UK. These specimens are fault breccia meaning that unlike other breccia they were formed by tectonic forces. Specimens are supplied in a white card tray with a information label.
Carboniferous coral limestone from Anglesey, North Wales. Composed largely of well preserved Lithostrotion corals
50 in 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
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.
196 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.
Out of stock
Carboniferous Mudstone found in Lancashire supplied in a card tray with a label.
300 in stock
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