﻿Vol. 64.] ijst the cakboniferotjs eocks at lopghshinnt. 449 



The fact^ that the Posidonomya-ma,xim.}im succeeds the Lime- 

 stone Massif at these points almost immediately (as it does the 

 basal P-beds of Loiighshinny), without the intervention of a thick 

 series of cherty, thinly-bedded limestones, is in agreement with this 

 suggestion. We should further expect that whenever, in the 

 North-Western Midlands, Cyat7iaa;onia-Beds are well developed (as, 

 for example, in the Worslow sequence) the underlying limestone 

 should contain a lower D^ fauna : this remains to be demonstrated. 



Comparison with the Lower Limestones of Fife. 



Material collected by Dr. Matley reveals the practical identity of 

 the brachiopod-fauna both in species and in variants, and this 

 resemblance extends in large measure to the Densiphyllids and 

 Zaphrentids. On the other hand, Clisiophyllids are rare at Lough- 

 shinny and extremely abundant in Scotland, where they exhibit 

 that remarkable wealth of variation which heralds rapid extinction. 

 (The Scottish development can be closely paralleled by the Aberdo 

 and Hendre Limestones of North Wales.) '■^ 



(5) Repetitions of Sequence. 



(5a) Fauna of the Beds South of Drumanagh Head 

 (LI, L2, and L 3). 



(i) Corals : 



Cladochonus. Cyathaxonia rushiana, Vaughau. 



8yringopora cf. ramulosa (Goldf.), ' CyathopJiylhim Murchisoni, Ed. & H. 



Ed. & H. (abundant). 



Syringopora cf. geniculata, Phill. 1 Litlio&trotion cf. affim (Flem.), Ed. & 



(•very narrow form). ' H. (abundant). 

 Mic'heliniatenuisepta,yQX.favositoides Lithostrotion irregiilare {Phill.), Ed. 



nov. ! & H. 



Densiphylliim cf. chariest onense, ; Lithostrotion jwic&iim (Flem.), Ed. 



Thomson. | & H. 

 Ainplexi-Zaphreniis (cf. Zaphrentis 



Enniskilleni, Ed. & H.). ' 



(ii) Brachiopods : 



Giganteid Productus. | Spirifer attenuatus, Sow. 



Spirifer aff. hisulcatus. Sow. j 



The level of these beds is clearly D P, and probably below the 

 first occurrence of Posidonomya. 



Lithostrotion cf. affine indicates L 4, the Michelinoid Favosites 

 links with the basal beds of P, and Cyathaxonia rushiana suggests 

 the persistence of that species into early P time. 



^ In ' The Palaeontological Succession of the Carboniferous Rocks in the 

 South of the Isle of Man ' (Proc. Yorks. Geol. Soc. vol. xvi, pt. ii, 1907, p. 137) 

 Dr. Wheelton Hind suggests the probable equivalence of the ' Knoll ' level at 

 Poolvasli with D3, and clraws attention to the attenuation of tlie cherty thinly- 

 stratified Cyathaxotiia-Beds in the 'Knoll' areas of theNorth-Western Midlands. 



^ See W. Hind & J. T. Stobbs, Gaol. Mag. dec. 5, vol. iii (1906) pp. 397, 398. 



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