Se PN ean es eS eT re ee 
ed i : 
in the Connecticut river Sandstone. 103 
sand is fine and the bottom hard. A gently oe , elongated 
bar, six or eight rods in length, running paralle the shore 
is here found. Its breadth is about half its length, and its ele- 
vation where the highest, twelve or fifteen inches above the nar- 
row flat creek-bottom between it and the shore. The breadth of 
this interval does not exceed ten or fifteen feet, the middle hal 
of which is nearly flat, while the sides therefrom slope upward 
very gradually each way. The bar is left bare at about half 
tide. The water flows in and out of the creeklet at both ends 
of the bar, and when the tide is saga high, flows back and 
forth cross-wise, to the bed of the creek. During the rising of 
the tide, the bed of this slineated "deprésiinn is more or less 
covered with water for nearly an hour before the bar is wholly 
submerged. bribes Aa this period, as well as at all other times 
while accessible, and best of all, at low water, when the surface 
is ee wholly bare, an sastied penles repetition of the second 
third varieties of the South Hadley impressions is every 
Hr visible, though the size of the cavities 1s constantly from 
two to threefold that of the fossil specimens. With singular 
precision may be seen the ee of the furrows (corres- 
ponding with the sea-margin), the cross partitions (though gen- 
erally more faint than in the shale), the zigzag margins formed 
by those sides of the cells which give rise to the furrow-rid 
the frequent splitting of a ridge so as to form an additional (an 
interpolated) furrow, the smoothing down of a ridge so far as to 
roduce the flat band, and the almost constant occurrence of the 
pean part of the trough on the down-hill side of the furrow. 
Other coincidences might be pointed out with the aid of ne 
ings; but the foregoing are perhaps sufficient for our purpos 
he’ appearances remained in full view during several days of 
calm weather, the pattern ne only slightly interfered with, 
during the ebbi ing and flowing of the tide. At low water the 
configuration of the era was invariable 
The examination of these sea-shore markings led me to recur 
toa Iai sandstone slab (with a surface two feet square) pro- 
cured two vil ago from the Forrest-marble Oolite sts ilt- 
Red Sandstone. The zigzag lines of the furrow rides sha po- 
sition and distinctness of the transverse partitions, the greater 
depth of the cavities constantly toward one side rather than in 
the oie of the furrows, and the occasional bifurcation of the 
ridges to embrace an additional trough are all plainly con- 
sci: “This specimen taken along with the Rockport sea- 
ore ripples leave no remaining doubt in my mind that the ori- 
