7
6
~
4
Intertidal Zone
133
~ l~~~*ffi~~~~~~~~~~~~~~~~~~~~~#H
2
I
o
2
-.
Immin9hom: semi diurnal type
San Franciso : mixed,dominont semi diurnol type
Manila : mixed, dominont 'ull diurnol type
"11 n A A n A Aft. - • A • 1\ A nAn Ann. - • 1\ n A A A I
I \llV vrvrv v vrV4QF~vlVVV~VVurvrvr~~VlJ
Do Son : full diurnal type
to" '12" '.e" ',," '1 8" '20 ' '22 . i4 26 28 30
(
. ,
Fig. 5.4. Tidal record s from harbor cities. At hallam the date s (March 1936) and the phases of the
moon . [A Defant, 1966, in G. Neumann, W. J. Pierson, 1966. Principles of physical oceanography.
Prentice-Hall , New Jersey]
In areas such as these lowlands, then, slight changes in sea level and the action of
heavy stonns bring marked changes in the type of sediment deposited. Typically, the
record which is preserved on the slowly sinking floor consists of an intercalation of
peat, salt marsh deposits, marine muds, and the sands and shells of the beach. Stonn
deposits are common within the intercalation. Similar sequences are quite familiar
from the geologic record (see Fig. 5.1). They are characteristic sea level deposits in
areas with high terrigenous sediment supply. The sea level controls the groundwater
level by damming up and floating the freshwater. The ensuing lack of drainage can
produce swamps from which peat bogs develop. In the geologic record these appear
as coal beds between marine sediments.
6
~
4
Intertidal Zone
133
~ l~~~*ffi~~~~~~~~~~~~~~~~~~~~~#H
2
I
o
2
-.
Immin9hom: semi diurnal type
San Franciso : mixed,dominont semi diurnol type
Manila : mixed, dominont 'ull diurnol type
"11 n A A n A Aft. - • A • 1\ A nAn Ann. - • 1\ n A A A I
I \llV vrvrv v vrV4QF~vlVVV~VVurvrvr~~VlJ
Do Son : full diurnal type
to" '12" '.e" ',," '1 8" '20 ' '22 . i4 26 28 30
(
. ,
Fig. 5.4. Tidal record s from harbor cities. At hallam the date s (March 1936) and the phases of the
moon . [A Defant, 1966, in G. Neumann, W. J. Pierson, 1966. Principles of physical oceanography.
Prentice-Hall , New Jersey]
In areas such as these lowlands, then, slight changes in sea level and the action of
heavy stonns bring marked changes in the type of sediment deposited. Typically, the
record which is preserved on the slowly sinking floor consists of an intercalation of
peat, salt marsh deposits, marine muds, and the sands and shells of the beach. Stonn
deposits are common within the intercalation. Similar sequences are quite familiar
from the geologic record (see Fig. 5.1). They are characteristic sea level deposits in
areas with high terrigenous sediment supply. The sea level controls the groundwater
level by damming up and floating the freshwater. The ensuing lack of drainage can
produce swamps from which peat bogs develop. In the geologic record these appear
as coal beds between marine sediments.