36 
THE GEOLOGIST. 
Yorkshire. Wills ami Gloucestershire. 
Conibrash • • Corubrasli. 
Upper Shale and Sandstone T'orest Marble, Bradford Clay. 
Bath Oolite . • Bath OoHte. 
Lower Shale and Sandstone EiiUer's Earth. 
Inferior Oolite . . Inferior Oolite. 
Both the upper and lower shales and sandstone are of fresh-water or estuary 
orio-in, and contain numerous plants, with Eqimehnn cohmnare, sometimes 
retauii'n"- its erect position, and occasional thin seams of imperfect coal. The 
upper series mav be observed to the south of Scarboro', in Gristhorpe Bay. 
At Staiuton Dale and Peak Hill, which forms the south side of Eobni Hood's 
Bav, the lower series attain their greatest dcTelopment, and are upwards of 
four huudred feet m thickness. At this spot the whole of the strata, from the 
Bath Oolite to the Upper Lias inclusive, may be observed in one grand section, 
which attains an elevation of nearly six hundred feet above the beach. The 
Upper Lias forms an underclifF, from which the superincumbent Lower Oolite 
strata rise almost perpendicularly, and are all but inaccessible. 
NOTES AND QUERIES. 
An "E-vely English" view of Adhe:maii's Theokt. — We are justified in 
designating many geological notions, introduced fifty years ago, as "Early 
English for the like simple form of a first -pointed window they have served 
the framework for an after-filling of thought-tracery, and have not suffered 
an obscuration from subsequent additions. This is particularily noticeable in 
theoretical geology ; no theory, either relating to physical or palseontological 
geology has appeared upon the' stage in its full dimensions, but like other great 
results of thought, has been built up slowly and added to in after times. As 
an example of this, I wish to bring before the notice of your readers, an early 
germ of the " Periodicy of Deluges," theory of iSI. Adhemar. I find it as an 
article in an old magazine, bearing date "Eebruary 4, 1812." The article is 
a long one, but the following intelligible resume concludes it : — 
" The following are the general deductions, which the preceding facts and 
reasonings seem to establish. 
1. That the changes upon the earth's sui-face, and the consequent phenomena 
of the strata and the fossil remains, are referable to certain known motions of 
the earth as a planet. 
2. That those motions are the revolution of the perihelion point, (a line of 
apsides,) in twenty thousand nine hundred years, producing opposite effects in 
both hemispheres every ten thousand four hundred and fifty years, and the 
diminishing obliquity of the ecliptic at the present rate of a degree in six 
thousand nine hundred years. 
3. That the periheUon forces, in varymg their declination, gradually accumn- 
late the seas in that hemisphere to which they are perpendicular ; and that the 
gradual accumulation takes place in either hemisphere, while the point of the 
maxima advances through twenty degrees of declination in a period of about 
three thousand four hundred and eighty eight years. 
4. That the accumulation of the'seas in that hemisphere, in which lies the 
direction of the perihelion parallel is a consequence of the accumulated centri- 
petal force, which produces or requires a corresponding increase in the centrifugal 
force, or oscillating momentum of the waters. 
