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610
D. MILNE HOME ON THE PARALLEL ROADS OF LOCHABER.
streams which now flow down the sides of the hills. These streams must
have existed durino- the period of the lakes. They may have flowed not
only into the lake, but also upon the detritus near the lake in Glen Roy at its
south end, and have cut out channels through the detritus, Avhich filled that
(lien near the present mouth of Glen Glaster. The distance between the
highest blockage in Glen Roy (viz. for Shelf 2) and Glen Glaster was small,
probably not more than a few hundred yards. The intervening mass of
detritus would, by the action of the hill streams, after a time be worn down,
and then the outflow of the lake would take the course of Glen Glaster, leaving
untouched the remainder of the detritus between Craig Dhu and Bohuntiuc.
If this was what happened, it is natural that the new line of blockage should
be (as shown by the terminations of Shelf 3) right across Glen Hoy, and parallel
with the new outlet through Glen Glaster.
Fig. 9. (Seep. 609.)
Section to exjiUin why the upper shelf in Glen filuoy C C extends farther down the glen
than the lowertshelf 1) D.
It is important next to notice what happened in Glen Collarig. It will be
seen from the maps (Plates XLT. and XLII.) that Shelf 3, when the lake
subsided to it, made its mark along the west side of IJoliuntine Hill, and also on
the opposite hill. The scooping out of the Collarig blockage need not have
happened at exactly the same time as the change in the Glen Roy blockage.
But the change was of the same nature, and was probably produced by a similar
cause. Strong streams rush dcjwu on each side of Glen Collarig, and at or near
the very place where the ])lockage must have originally existed. These streams,
descending on the detritus, would wear down and remove a large part of it,
and so allow of the extension of this arm of the lake farther south in the glen.
The next change which took place was the entire removal of the blockage
between Craig Dhu and Bohuntin*', whereby th<> lake reached the lowest
level, viz., that marked l)y Shelf 4. This change might be effected in the course
of the general erosion which hud long been going (in. In the first place,
D. MILNE HOME ON THE PARALLEL ROADS OF LOCHABER.
streams which now flow down the sides of the hills. These streams must
have existed durino- the period of the lakes. They may have flowed not
only into the lake, but also upon the detritus near the lake in Glen Roy at its
south end, and have cut out channels through the detritus, Avhich filled that
(lien near the present mouth of Glen Glaster. The distance between the
highest blockage in Glen Roy (viz. for Shelf 2) and Glen Glaster was small,
probably not more than a few hundred yards. The intervening mass of
detritus would, by the action of the hill streams, after a time be worn down,
and then the outflow of the lake would take the course of Glen Glaster, leaving
untouched the remainder of the detritus between Craig Dhu and Bohuntiuc.
If this was what happened, it is natural that the new line of blockage should
be (as shown by the terminations of Shelf 3) right across Glen Hoy, and parallel
with the new outlet through Glen Glaster.
Fig. 9. (Seep. 609.)
Section to exjiUin why the upper shelf in Glen filuoy C C extends farther down the glen
than the lowertshelf 1) D.
It is important next to notice what happened in Glen Collarig. It will be
seen from the maps (Plates XLT. and XLII.) that Shelf 3, when the lake
subsided to it, made its mark along the west side of IJoliuntine Hill, and also on
the opposite hill. The scooping out of the Collarig blockage need not have
happened at exactly the same time as the change in the Glen Roy blockage.
But the change was of the same nature, and was probably produced by a similar
cause. Strong streams rush dcjwu on each side of Glen Collarig, and at or near
the very place where the ])lockage must have originally existed. These streams,
descending on the detritus, would wear down and remove a large part of it,
and so allow of the extension of this arm of the lake farther south in the glen.
The next change which took place was the entire removal of the blockage
between Craig Dhu and Bohuntin*', whereby th<> lake reached the lowest
level, viz., that marked l)y Shelf 4. This change might be effected in the course
of the general erosion which hud long been going (in. In the first place,
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| Early Gaelic Book Collections > J. F. Campbell Collection > On the parallel roads of Lochaber > (34) |
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| Permanent URL | https://digital.nls.uk/80970418 |
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| Description | By David Milne Home. From the Transactions of the Royal Society of Edinburgh, vol. XXVIII. |
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| Shelfmark | Cam.1.a.1(1) |
| Additional NLS resources: | |
| Attribution and copyright: |
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| Description | Volumes from a collection of 610 books rich in Highland folklore, Ossianic literature and other Celtic subjects. Many of the books annotated by John Francis Campbell of Islay, who assembled the collection. |
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| Description | Selected items from five 'Special and Named Printed Collections'. Includes books in Gaelic and other Celtic languages, works about the Gaels, their languages, literature, culture and history. |
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