THE GEOLOGIST. 
Errata in Mr. Du Noyer's PArER on the Giant's Causeway.— 
Dear Sir, — Please to call attention to tlie following typograjihical errors in tlic 
paper on tlie Canseway. Any praetieal geologist seenig iign. 7, p. 10, called 
"The Whin Dyke," wonld at once perceive the" error. No dvke of basalt ever 
assumed the appearance given in lign. 7 when vertical, but it niiglit if it were' 
horizontal, when, liowever, tlie coliinuis would be more regular than those 
shown in the figure I allude to. The peculiar character of all trap-dykes is 
a a 
Silui'ian Slate. Trap Dyke. SOurian Slate. 
their tendency to columnarize at right angles to their walls, or cooling surfaces ; 
wliile what may be termed joints of shruiking (a a) become very numerous and 
close at the edges of the dyke. In many instances the dyke at its sides de- 
composes into a soft brown shale. 
At p. 11 the allusion to Ugn. 7 refers to lign. 6. — Yours very truly, 
Geo. V. Du Noyer. 
Notes of Fossiliferous Localities of the Old Red Sandstone op 
THE East of Scotland. — Should any amateur geologists, delighting in a 
pedestrian excursion, relieved occasionally by a little rail and steamboat 
travelling, be desirous of visiting the fossiliferous districts of the Old Hed 
Sandstone of tlie east coast of Scotland during the ensuing season for rambles, 
I think the following remarks may be of some service in the search for speci- 
mens. The trip, by using a little despatch, will take about five or six weeks ; 
to go thoroughly to work, and obtain a perfect knowledge of the localities, &c., 
would rccpiire at least five or six months. However, I was not able to spare 
more than six weeks, and during that time I visited aU the most important 
places of interest to the geologist in that part of Scotland, with tolerably fine 
weather, and without being overburdened with baggage, but possessing a very 
useful and moderate-sized hammer (a small hammer is of no use in this dis- 
trict) and a couple of stone-chisels (large and small) ; with these tools you can 
encounter a nodule of almost any size ; but the hammer itself wiU generally 
prove sufficient, unless the nodule breaks crossways. 
At the end of these rough remarks 1 have given a list of all the Old Red 
fishes found in Scotland, with the locality of each species ; tiiis may be useful, 
to enable the tourist to know what species are to be met witii in the places he 
visits. I have taken each place in the order I visited them, commencing with 
Cromarty, the locality rendered famous by Hugh Miller, as the first ex- 
amined by him in his researches on the Old Red Sandstone, nearly thirty years 
ago. There are many species found here, but rarely any in a remarkably good 
state of preservation ; the most abundant appear to be the ])iplacanthvs strhdvs 
and a Cheiracanthus. Large numbers of sea-worn nodules containing the re- 
mains of fishes may be picked up on the coast at low water, especially after 
rougii weather ; these seldom contain anything very fine. I searched nearly a 
whole day with very little success ; howe\"er, the next day I was more for- 
tunate in jnocuring several good specimens by digging some two or three feet 
in one or two beds on the shore containing the nodules. These were some of 
the beds that Hugh Miller used to visit in his geological rambles. It is not, 
