The Cruise of the Betsey: or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of ScotlandMiller, Hugh
Philosophy
The Cruise of the Betsey: or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland
Miller, Hugh
Geology -- Scotland
and unfenced patches of corn here and there alternate with plantings of
dark sombre firs, in their mediocre youth. At length we near the
southern boundary of the landscape,--an undulating moory ridge,
partially planted; and see where a deep gap in the outline opens a way
to the upland districts of the province, a lively hill-stream descending
towards the east through the bed which it has scooped out for itself in
a soft red conglomerate. The section we have come to explore lies along
its course: it has been the grand excavator in the densely occupied
burial-ground over which it flows; but its labors have produced but a
shallow scratch after all,--a mere ditch, some ten or twelve feet deep,
in a deposit the entire depth of which is supposed greatly to exceed a
hundred fathoms. The shallow section, however, has been well wrought;
and its suit of fossils is one of the finest, both from the great
specific variety which they exhibit, and their excellent state of
keeping, that the Upper Old Red Sandstone has anywhere furnished.
So great is the incoherency of the matrix, that we can dig into it with
our chisels, unassisted by the hammer. It reminds us of the loose
gravelly soil of an ancient graveyard, partially consolidated by a
night's frost,--a resemblance still further borne out by the condition
and appearance of its organic contents. The numerous bones disseminated
throughout the mass do not exist, as in so many of the Upper Old Red
Sandstone rocks, as mere films or impressions, but in their original
forms, retaining bulk as well as surface: they are true graveyard bones,
which may be detached entire from the inclosing mass, and of which, were
we sufficiently well acquainted with the anatomy of the long-perished
races to which they belonged, entire skeletons might be reconstructed.
I succeeded in disinterring, during my short stay, an occipital plate of
great beauty, fretted on its outer surface by numerous tubercles,
confluent on its anterior part, and surrounded on its posterior portion,
where they stand detached, by punctulated markings. I found also a fine
scale of _Holoptychius Nobilissimus_, and a small tooth, bent somewhat
like a nail that had been drawn out of its place by two opposite
wrenches, and from the internal structure of which Professor Owen has
bestowed on the animal to which it belonged the generic name Dendrodus.
I have ascertained, however, through the indispensable assistance of Mr.
George Sanderson, that the genus Holoptychius of Agassiz, named from a
peculiarity in the sculpture of the scale, is the identical genus
Dendrodus of Professor Owen, named from a peculiarity in the structure
of the teeth. Those teeth of the genus Holoptychius, whether of the
Lower or Upper Old Red, that belong to the second or _reptile_ row with
which the creature's jaws were furnished, present in the cross section
the appearance of numerous branches, like those of trees, radiating from
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