Correspondence—Ur. G. H. Kinahan. 189 
localities pass through my hands, and the similarity is beyond all 
question. Now these plants are found in the Grés ‘“ supérieurs aux 
lignites.” The Lignites themselves rest in the neighbourhood of 
Paris on mottled clay, absolutely identical with that of our Reading 
beds, and are the undoubted equivalents of the Woolwich series, 
consisting of stiff bluish clay with blackish bands and some fossil 
wood, exactly as in the Croydon cutting. Immediately on their 
eroded surface we find the calcareous Bracklesham beds with Num- 
mulites levigata, so that there is a hiatus in the Paris area represented 
in our series by the Oldhaven, London Clay, and Lower and Middle 
Bagshot. 
We may place the Grés de Belleu anywhere in this interval, and 
the only reasonable conclusion to be drawn is that they do not 
belong to the Soissonnais series at all, but lie on it unconformably, 
or only apparently conformably on it, just as our Lower Bagshots 
lie on the London Clay at Alum Bay. In this case, while Prof. 
Prestwich’s correlation of the ‘‘ London sands” or marine so-called 
Lower Bagshot with the sands of Cuise-la-Motte and the Upper 
Ypresian is unaffected, the totally distinct fresh-water and true 
Lower Bagshot will also have its equivalent in the Paris Basin. 
The suspected connection between the Floras of Alum Bay and 
Sheppey is strengthened by the flora of these Grés, for I have recog- 
nized quite a number of casts of fruits in them which are identical 
with Sheppey forms. J. STARKIE GARDNER. 
LARGE IRISH BOULDERS. 
Srr,—In the Co. Galway, as mentioned in my Geology of Ireland, 
p- 248, also in the Geol. Survey Memoirs, the boulders are larger and 
more numerous than elsewhere in Ireland, much larger than any I 
have seen in the Co. Wicklow. The Ballagh Stone, a few miles 
N.W. of Galway, is about 21 x 24 x 20 feet. Clogh Currill is as 
large, and very like one of the ancient castles, while many others are 
much larger than the ordinary cabins of the country; they are all 
granite blocks. Huge limestone blocks once existed on the sand- 
stone ridge near Ballingarry, Co. Limerick, but I am afraid that now 
they are all quarried away and burnt into lime (Geol. Survey Mem.). 
In the Co. Waterford Du Noyer drew attention to the huge con- 
glomerate blocks, some of which he figured (Geol. Survey Mem.). 
The largest I saw was Clogh-na-Kilcluney, to the S.E. of the Come- 
ragh Mts. One nearly as large is Clough-lowrish, figured by Du Noyer. 
In the Co. Wicklow, Wyley seemed to consider the largest to be 
that of Boleynass, near the Devil’s Glen. Kath boulder, near the 
Bush Railway Station, Co. Louth, is 82 x 20 x 9 feet (Geol. Survey 
Mem.). In this district there are many whinstone blocks of large 
dimensions. §S.W. of Ballina there are many erratics referred to 
years ago by Sir R. Griffith and Archdeacon Verschoyle. One granite 
block N.W. of Carrowmore has been calculated to exceed 415 tons in 
weight (Geol. Survey Mem.). G. Henry Kinanan. 
GEOLOGICAL SuRVEY oF IRELAND, 
14, Hume Srreet, Dusiin. 
