MICROPALÆONTOLOGY Of POSTGLACIAL DEPOSITS. 457 
Prat Moss No. 1. (Text-fig. 1.) 
Situated near the sign FA (second terrace of freshwater alluvia) south 
of *S" in “Station” (Achnasheen Station), south of the R. Bran, which 
connects Loch a’ Chroisg with L. Achanalt, this lake draining into Cromarty 
Firth. Altitude above sea-level about 150 m. Thickness of peat 
averaging 145 em. 
The surface of the moor was clothed with a Calluna-Scirpus cwspitosus 
association with Carex pauciflora, Drosera longifolia, D. rotundifolia, Erica 
Tetralix, Eriophorum vaginatum, Juncus squarrosus, and Narthecium ossi- 
fragum. This peat moss is a typical “tourbière morte,” and by process of 
erosion deep hags have been cut which sometimes reach the underlying sand. 
A great number of pine-stools rest upon this sand, and protrude about 60 cm. 
into the peat. The micro-analysis of the well-humified peat shows that the 
TEXT-FIG. l. 
0 10 20 30 40 50 60 %a 
N 
\ 
| N 
Da BEL = 
m 
bd 
aL 
—o— Alnus. —o— Betula. —e— Pinus, — eo Ulmus. 
Quercus. —-------- Tilia. _-g-- Corylus. 
greater part has been formed by Sphagnum. In samples 1 and 2, 5. imbri- 
catum was noted. In the upper part of the peat, remains of Scirpus cwspitosus 
and other species belonging to the recent vegetation were common. There is 
no trace of sand, not even in the stratum immediately above the sand. 
If this bog were investigated by the old methods, the investigator would, 
almost certainly, have tried to explain the sequence of layers in the following 
way :— 
A. 85cm. Recent Peat, consisting chiefly of Sphagnum with Scirpus 
cæspitosus remains. 
B. 60 em. Upper Forest, large stools of Pinus. 
C. (at 145 cm.) Sand. 
If, however, we compare the pollen diagram (text-fig. 1) of this peat moss 
with the other diagrams, it becomes perfectly clear that the lowest layer (the 
layer from which sample 6 was taken) best corresponds with Lewis’s Lower 
Forest Bed, despite the fact that Lewis never found pine in this bed. The 
