The Old Red Sandstone, Or, New Walks in an Old Field

abundance acquainted Agassiz ancient animal appearance Balruddery body bone bony Caithness carboniferous Carmylie cartilaginous Cephalaspis character Coal Measures coast Coccosteus colour composed conglomerate Cornstone cotemporaries covered creature Cromarty crustacean curious deposit depth described diluvium Dipterus edge Edinburgh enamelled entire existing feet fins fish Forfarshire fossils fragments furnished geological geologist gneiss granitic gray hills Holoptychius huge hundred ichthy ichthyolite beds inch jaws Lias lime limestone localities lower formation Lower Old Red marked mass minute Moray Moray Frith Murchison nigh nodules northern occur ocean Old Red Sand Old Red Sandstone Oolite organisms osseous Osteolepis pebbles peculiar period plates portion precipices present Pterichthys quarry rays reader remains reptiles resembling ridge rock scales schists Scotland seems shells shore side Silurian skeleton species specimens spines stone strata stratified clay stratum surface Sutor tail teeth thick thickly tion trilobite tubercules vast vegetable vertebral column vertebrated