The Silurian Moth (Eriopygodes imbecilla) is a moth of the family Noctuidae with a wing span of between 22 and 28 mm found in wet meadows and peaty biotopes often close to streams and springs in Europe and Asia. A single generation flies from June to July. Research Silurian Moth
Trilobita is a class or subphylum of oval, flattened arthropods (Phylum Arthropoda) with five pairs of head appendages. They were all marine, becoming extinct after the Silurian period. Research Trilobita
The term trilobite is applied to any one of numerous extinct marine arthropods that resembled large woodlice and belonged to the subphylum Trilobita. The trilobites had a jointed horny body divided into three section - hence their name - an anterior solid cephalon, a segmented thorax or trunk, and a posterior pygidium. The fossil remains of trilobites are frequently found in Palaeozoic rocks, predating the fishes, and seem to have flourished in great numbers during the Cambrian and Silurian periods, remains having been found of trilobites ranging from minute to large at over 40 cm long. Research Trilobite
The Archaean is the earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life. This is equivalent to the formerly accepted term Azoic, and to the Eozoic of Dawson. Research Archaean
In geology, the Caradoc sandstone is an upper division of the lower Silurian rocks, consisting of red, purple, green, and white micaceous and sometimes quartzose grits and limestones containing corals, mollusca, and trilobites. Named after the hilly range of Caer-Caradoc in Shropshire. Research Caradoc Sandstone
In geology, a formation is any series of rocks referred to a common origin or period, whether they consist of the same or different materials. Geological strata are divided into certain groups of one era of deposition, sometimes of very dissimilar mineralogical character, but inclosing the same fossil species; such as, the Carboniferous, Oolitic, Cretaceous, Silurian, Laurentian, etc. Research Formation
Graywacke is a metamorphic sandstone in which grains or fragments of various minerals, as quartz and feldspar, or of rocks, as slate and siliceous clay rocks, are embedded in an indurated matrix, which may be siliceous or argillaceous. The colours are grey, red, blue, or some shade of these. The term, as used by the earlier writers, included all the conglomerates, sandstones, and shales of the older formations, when these had been subjected to considerable change. At first it was nearly synonymous with the Silurian strata, these, especially in Scotland, yielding the only genuine graywacke. The term has been little used since the start of the 20th century. Research Graywacke
The Salina Beds belong to the Upper Silurian of North America, and are the lower subdivision of the Onondaga group. They consist mainly of red marls with limestone, dolomite, and extensive beds of rock-salt, especially in the state of New York. As a whole, these rocks are unfossiliferous, and seem to have been laid down in shallow waters exposed to desiccation. They extend northwards into Ontario, crossing the Niagra river a little above Niagra Falls. Research Salina Beds
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Matt and Leela Probert
Abbreviations
Research Silurian Moth
