320 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
west of Lake Peipus, reaches the coast south of Hapsal and forms a 
part of the south end of Dago. In the east it outcrops over an area 
about thirty miles wide from north to south, but south of Hapsal the 
belt of its outcrops is only a few miles wide. 
The quarry of the type-locality is in a forest about three miles north- 
west of the Raikiill residence, and is reached by a road branching off 
from the main road a little to the west of the entrance to the estate 
(Plate 3, fig. 2). About ten feet are exposed. The lower eight feet 
consist of well-bedded, probably dolomitic limestone with the beds 
varying in thickness from three to eight inches and these are exten- 
sively quarried for construction purposes. Very few fossils are 
present. The upper two feet consist of thin-bedded rough limestone 
in which are many corals, chiefly Favosites gothlandicus, Halysites 
catenularia, and Clathrodictyon vesiculosum. 
Certain beds of this zone are much more extensively exposed near 
the village Lippa, situated about three miles south of Raikiill. The 
quarry covers an acre or two and appears to have been continuously 
operated for many years, but only about four feet of strata are ex- 
posed. The rock is a hard, white, crystalline limestone with which is 
interstratified a little softer, almost microcrystalline limestone of the 
same color. The former is dolomitic, and both are in beds from three 
to six inches thick. At the top are myriads of corals, many of which 
are silicified. They are not uniformly distributed through the rock, 
but are aggregated in patches and the species are the same as men- 
tioned for the Raikiill locality and, in addition, many Heliolitidae are 
also present. A layer of the softer crystalline limestone is particularly 
characterized by numerous, fine, large specimens of Leperditia keyser- 
lingt Schmidt. 
A more extensive exposure of this division is near Weissenstein on 
the Miintenhof estate, where the beds exposed reach a thickness of 
twenty feet. The lowest fifteen feet consist of well-bedded bluish 
and yellowish crystalline dolomitic limestone in which only obscure 
fossils were seen and these were near the top. The beds are from 
four to six inches thick, and one about two feet below the top contains 
flattened mud pebbles with the horizontal diameters reaching an inch 
and the vertical diameters about a fourth as great. Overlying these 
strata are from five to six feet of cavernous yellow dolomite with 
gnarled structure and a general absence of bedding. This is probably 
an old coral reef and it still contains numerous poorly preserved 
specimens of Favosites and Clathrodictyon. Many of these are 
merely skeletons and after the exterior has been broken, crumble on 
being touched. 
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