Transactions of the Geological Society of Glasgow
ON THE CARBONIFEROUS FOSSILS VERMILIA MINUTA, Brown. Bare. In the upper limestone shales, on shells and crinoids. Robroyston; Capelrig, E. Kilbride; Highfield, Dairy; Gare. NOTE.-There are at least six other seemingly distinct forms of Annelids in our col lections from the marine limestone shales which await determination. They appear to belong to the genera Serjnda, Serpulites, and Spirorbis. Crustacea.-This class of articulated animals presents us with several families and genera, some of
... h contain numerous species. Of the great extinct family of the Trilobites only four species; belonging to the genus Griffithides, have as yet been found in our beds. They range from the bottom to the top of the lime stone series, where they seem to have become finally extinct, no remains of Trilobites having been found in the upper coal measures or more recent strata. There are few localities in Scot land where they have been obtained in such great numbers, or with their parts so well-preserved, as in the upper limestone at Bowertrapping, near Dairy, in Ayrshire. In this bed they are prin cipally confined to a thin layer in the upper portion of the stratum. Remains of Trilobites in good preservation are sometimes found at Orchard, near Thornliebank; the old quarries of High Blantyre, Boghead, and East Kilbride; also in the limestone shales at Gare, and Westerhouse, near Carluke-all in the upper limestone series; but in none of these localities are they abundant. Another family of Crustaceans found in our strata is the numerous group termed Ostracoda. They are in general very minute in size, and enclosed in bivalve shells. They are found in nearly all our fossiliferous beds, from the lowest to the highest in the series, and a few of the marine species are recurrent in the Permian formation of England. There are two groups, one of which is decidedly marine in its habitat, while the other seems to be con fined exclusively to the brackish or fresh-water beds, ranging in these from the bottom of the limestone series in some districts, to the top of the upper coal strata. This latter group, although often found in the lower limestone series in beds which alternate with others containing marine fossils, has never been found, except in the case of one doubtful species, mixed up with the fossils of marine beds. On the other hand, none of the marine Ostracoda occur in Library on July 1, 2015 at Carleton University http://trngl.lyellcollection.org/ Downloaded from OP THE WEST OF SCOTLAND. 25 the brackish or fresh-water beds. Such a difference in the habitats of the two groups implies elevations and depressions of the ancient land surface, sufficient to produce bhe different conditions of the waters in which they lived. The Rev. David Ure was the first who seems to have found Ostracoda in our carboniferous strata. In bis History of Rutherglen and East Kilbride, published in 1793, he figures four species from the upper limestone shales of East Kilbride, and terms them u microscopic shells." Until the last few years not more than some five or six forms were known to occur in our beds; but through the researches of members of this society, aided by Professor T. Rupert Jones and J. W. Kirkby, in the determina tion of the species, the list has now been increased to nearly sixty, of which two-thirds are new to science. They have been obtained from the washing of the weathered limestone shales, and by crushing the limestones and ironstones known to contain them, there being few fossiliferous localities in the west of Scotland where they have not been met with. Several forms belonging to other families and groups of the Crustacea are met with occasionally in our western coal field, some of which are peculiar to the marine limestone series, as Eurypterus^ Dithyrocaris, and Cyclus; others, again, to the brackish or fresh water beds, as Pygocephalus, Anthrapalcemon, Belinurus, Prestwichia, and Estheria. All of these forms are very rare in our fossiliferous localities, and at present one or two of the species are unique. CRUSTACEA. 1. BAIRDIA BREVIS, /. and K. Moderately rare. Lower limestone. Main limestone, Carluke; Brock ley; Craigenglen. 2. B. CURTA, var. PLEBEIA, Ji and K. Common. Upper limestone-Orchard; Williamwood; High Blantyre; Swindridge; lower limestone-first Kingshaw limestone, Carluke; Brock ley; Craigenglen; Broadstone; Howrat. 3. B. GRANDIS, J. and K. Very rare. Productus punctatvs beds, lower limestone series. Carluke. Library on July 1, 2015 at Carleton University http://trngl.lyellcollection.org/ Downloaded from 11. B. MULTILOBA, JmtS. Moderately common. Upper limestone-Boghead; Limekilns, E. Kilbride; lower limestone-Rae's Gill, in alum shale; Oraigenglen; Tirfergus Glen, Campbeltown. 12. B. RADIATA, J. and K. Rather rare. Upper limestone-Orchard; Robroyston; High Blantyre; Boghead; lower limestone-Oraigenglen. 13. B. RIOIDA, J. and K. Rather rare. Orchard, near Thornliebank. 14. CYPRTDINOPSIS SIMPLEX, J andK., Men. Carb. Entom., pi. ii" fig, 1, Rare. First calmy limestone, Braidwood. 15. C. YOUNGIANA, J. and K. Rather rare. A very local species. Lower limestone. South Hill, Campsie in dark blue shale above the Hosie limestone, along with Goniatites, Bellercphon, Nuculm, and Spirifera Urii; Carluke, in an iron stone nodule, in shale, first Kingshaw limestone.