Sedimentary Collection (page 4)

Puddingstone is a conglomerate or mixture of different, irregular sized grains and pebbles held together by a finer matrix

Shale
Compacted platy clay particles give shales their typical laminated structure. Shale is a sedimentry rock which is composed of many fine-grained clay particles

Sandstone is formed by loose grains of quartz compacted and cemented together

Flint hand-axe
Late Palaeolithic from Farnham, Surrey, England

Flint nodule
This flint nodule originates from the Cretaceous rocks of the North Downs, England

Dalmanites myops, trilobite
A Silurian fossil trilobite from the Wenlock Limestone, Dudley, Worcestershire. This specimen measures 40mm head to tail

Hones for sharpening metal edges
The longest hone here dates back to the 12th century and was discovered in Winchester however the rock type matches specimens of schist from quarries in Eidsborg in Norway

Rhynchosaurus footprints
Fossil footprints made by Rhynchosaurus on a slab of Triassic, Keuper Sandstone from a quarry in Rathbone Street, Liverpool. Dimensions of slab are 5 inches x 6 inches

Lonsdaleia, coral
Shown here is the Carboniferous coral, Lonsdaleia. Corals comprise a soft bodied animal called a polyp. Each polyp inhabits a calcareous skeleton called a corallum

Slate
Cambrian slate from North Wales. Slate is metamorphosed shale

Hyolithes, primitive mollusc
Shown here is Hyolithes, a Cambrian primitive mollusc. Hyolithes had an oval or cone-shaped, elongated shell and often occured in clusters along bedding planes of Cambrian shale

Sandstones
A collection if sandstones showing colour variations. Clockwise from the left: green Ightham Stone, brown St Bees, beige L Coal Measures from Derbyshire and striped from Stirling

Quartzite

Rhynia major, fossilised plant
A complete soft tissue preservation at the cellular level in Rhynia major. Transverse section through stem, approximately 2mm in diameter. From Rhynie Chert, Scotland, Early Devonian

Coal, from the late carboniferous
Coal is formed from fossil plants. The regular pattern on the surface of this 14 cm long piece is the impression of the bark of a fossil tree; Lepidodendron

Turquoise vein in shale
Turquoise (hydrated copper aluminum phosphate) vein in shale, from Victoria, Australia. Turquoise is perhaps the most valuable non-transparent mineral

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