In Wales the group is typically developed between namesake Ludlow and Aymestrey, and it occurs also in the detached Silurian areas between Dudley and the mouth of the Severn.
In the Lake District the Silurian Coldwell beds, forming the upper part of the Coniston Flags, are the equivalents of the Lower Ludlow.
In the Silurian areas of southern Scotland, the Ludlow rocks are represented in the Kirkcudbright Shore and Riccarton districts by the Raeberry Castle Beds and Balmae Grits (500–750 ft.).
Trilobites are numerous (Phacops caudatus, Lichas anglicus, Homolonotus delphinocephalus, Calymene Blumenbachii); brachiopods (Leptaena rhomboidalis, Rhynchonella Wilsoni, Atrypa reticularis), pelecypods (Cardiola interrupts, Ctenodonta sulcata) and gastropods and cephalopods (many species of Orthoceras and also Gomphoceras, Trochoceras) are well represented.
The common Upper Ludlow fossils include: plants (Actinophyllum, Chondrites), ostracods, phyllocarids, eurypterids; trilobites (less common than in the older Ludlow sub-groups); numerous brachiopods (Lingula cornea, Lingula minima, Chonetes striatella); crustaceans (ostracods); gastropods (Phyllocarida, Platyschisma helicites); bivalvia; and cephalopods (Orthoceras bullatum); and fish (Cephalaspis, Cyathaspis, Auchenaspis).