Dinantian is the name of the Lower Carboniferous period (which started 354 million years ago), and specifically a series of rocks in Europe which were deposited during the period. The Carboniferous is a geologic period and system that extends from the end of the Devonian period about 359 Another name for this period is the Avonian, a name proposed by Dr Arthur Vaughan in 1905 (Q. Year 1905 ( MCMV) was a Common year starting on Sunday (link will display full calendar of the Gregorian calendar (or a Common year starting J. G. S. vol. lxi. p. 264) for the rocks of Lower Carboniferous age in the Avon Gorge at Bristol. For the gorge in Scotland with the same name see Avon Gorge Falkirk The Avon Gorge ( is a 1 Bristol ( ˈbrɪstəl is a city, Unitary authority and ceremonial county in South West England, west of London