TRANSACTIONS OF SECTION C. 655 



The bones obtained of the mammoth are not so numerous, the chief being thirty- 

 one ribs, one 50 inches in length and 11 in circumference ; several vertebrje, some 

 14i inches across ; a massive tusk 12§ feet with a portion broken oft'; and a tooth 

 weighing 16^ lbs. The writer also refers to remains of Proboscoidea found at other 

 points in Ontario, viz., St. Catharine's, Duunville, Goat Island, Niagara Falls, and 

 Kimbal, near the western side of the province. 



4. Nute on the occurrence of Anamonites jurensis in the Ironstone of the 

 Northampton Sands, in the neighbourhood of Northampton. By E. T. 

 Newton, F.G.S., F.Z.S. 



This paper records the discovery, by Mr. Thomas Jesson, of Ammonites jurensis 

 in the ironstone of the Northampton Sands at Brixworth, near Northampton. A 

 considerable number of fossils were collected, most of which were referable to 

 A771. jurensis and Am. ojialiyius; but with these were also found ^)?2. insignis, Am. 

 Murchisona;, Nautilus, Belenvnites, Trigonia compta, Triyonia V. Scripita, and 

 Tancredia. 



5. On certain Ammonite- zones of Dorset and Somerset. 

 By S. S. BucKMAN, F.G.S., Hon. Memb. Yorks. Phil. Soc. 



The lower part of the Murchisonce-zone is often intimately connected with th& 

 upper part of the Opctlinmn-zone ■,hut, a little higher, there is a horizon characterised 

 by numerous specimens of Lud^oigia Murchisona. The fauna of this horizon corre- 

 sponds to the Murchtson(s-zoi\e of Oppel, and to the Brauner Jura (3 of Queustedt. 

 Above the Murchisones-zone a considerable break in the sequence of strata is 

 frequently met with. In the neighbourhood of Bradford Abbas, however, is 

 found, superior to the Murchisona-zone, a horizon marked by a very peculiar 

 fauna, in which Lioceras concavum and species of the genus Sonninia predominate. 

 Taken in a general sense the fauna of this zone (Concavum-zon^) does not agree 

 "with that of Quenstedt's Brauner Jura /3 or y, or with that of the Sowerbyi-zone, 

 as illustrated by Waagen, Douville, &c. Further, the Sonninia> of the Concavum- 

 zone are, biologically, of an earlier type than those of the Sotcerbyt-zone. 



Continental authors find a marked stratigraphical and palaeontological break 

 between the Murchisona- and So2oerbyi-zones ; and they wish to draw, at this point, 

 a dividing line between Lias and Oolite, or between Toarcian and Bajociau. It is 

 suggested that the absence of the Concavum-zone is the cause of this break ; and, in 

 former papers to the Geological Society, the author, in supporting the Continental 

 plan, regarded the Concavwn-zone as Toarcian. 



In the Bradford Abbas district there is a break above the Concarum-zovie. So 

 far as is known at present, Dundry is the only locality showing a complete sequence ; 

 but some years ago a quarry — Coombe, near Sherborne — was open, and it yielded 

 a large series of Ammonites indicating a fauna agreeing with the Sowe7-byi-zone, as 

 illustrated by Continental authors. This quarry has been closed for years; and 

 nothing is known as to how the strata are situated with regard to the Concavum- 

 zone below, or with superior horizons. It is richer than Dimdry, and is, practically 

 speaking, unique among Inferior-Oolite exposures. It is the only locality in England 

 ■which yields this particular fauna. So far as is known, the true Sotverbyi-zone is 

 absent from all quarries in Dorset and Somerset, with the exception of Coombe and 

 Dundry ; and, therefore, the majority of exposures in the district fully support the 

 Continental geologists in their contention as regards a dividing line. 



Waagen places a zone of Am. Sauzei above the Soirerbyi-zone ; and a horizon 

 •with this species and with a particular fauna is shown in ' the marl with green grains ' 

 at Frogden quarry, near Sherborne. 



Above this is the zone of Am. Humphriesianus, in which Stephanocei'as and 

 Sphcnroceras predominate. This is the equivalent of the Coronaten-schichten of 

 Quenstedt's Brauner Jura S. The upper part of the Brauner Jiu-a 6 is the Bifur- 

 caten-schichten ; and this corresponds with the Cadomensis-heiXs of Frogden — a 



