This sequence is based on the Marooner's Rock sequence in the original play and book and, like Disney's non-canon " Skull Rock ", Black Castle replaces Marooners's Rock in this film.
32.
A consequence of this approach to the Phanerozoic periods is that the ages of their beginnings and ends can change from time to time as the absolute age of the chosen rock sequences, which define them, is more precisely determined.
33.
The rocks are so intensely folded that most have been tilted nearly 90? with the tops of layers on one side of the synclinal belt facing those on the other side; the rock sequences are in effect lying on their sides.
34.
Marine Band, the South Wales rock sequence which had formerly been assigned to the'Upper Coal Measures'( which was also referred to as the'Pennant Measures') is no longer considered to be a part of the Coal Measures and is now designated as the Warwickshire Group which is itself subdivided into the Pennant Sandstone Formation and overlying Grovesend Formation.
35.
In 1832 Dr Thomas Lloyd, the Ludlow doctor and amateur geologist, met Roderick Murchison at Ludford Corner to study the rocks exposed along the River Teme and on Whitcliffe, advancing Murchison's theory for a Silurian System that he was to publish in 1839 . Immediately above the topmost layer of the marine rock sequence forming Murchison's Silurian System was a thin layer of dark sand containing numerous remains of early fish, especially their scales, along with plant debris, spores and microscopic mites.
36.
In 1832 Dr Thomas Lloyd, a Ludlow doctor and amateur geologist, met Roderick Murchison at Ludford Corner to study the rocks exposed along the River Teme and on Whitcliffe, advancing Murchison's theory for a Silurian System that he was to publish in 1839 . Immediately above the topmost layer of the marine rock sequence forming Murchison's Silurian period was a thin layer of dark sand containing numerous remains of early fish, especially their scales, along with plant debris, spores and microscopic mites.
