On the GBR, this existed between about 8 and 5.5 ka
when outer reefs lagged behind those of the inner shelf
(including fringing reefs) and did not protect the inner
shelf reefs. Much of the carbonate productivity went
into building coral shingle ridges on the shores of adjacent high islands. Subsequently, there has been a decline
in both the rate of reef growth (including fringing reef
progradation) and shingle ridge accumulation (Smithers
et al., 2006).
Summary/conclusions
Broadly speaking, reef accretion in both the Indo-Pacific
and Caribbean regions is dominated by ice-sheet-meltdriven sea-level changes through the Holocene. Differences
in reef morphology between the two regions, including the
amount of framework coral and the extent of reef flats,
reflect relatively small-scale variations in regional RSL,
which occurred since the mid Holocene. These differences
are due to long-lived global-scale isostatic processes which
cause sea-floor subsidence (RSL rise) in some regions and
RSL fall in others since the mid Holocene.
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Cross-references
Glacio-Hydro Isostasy
Holocene High Energy Window
Holocene Reefs: Thickness and Characteristics
Paleoclimate from Corals
Postglacial Trangression
Reef Classification, Response to Sea Level Rise
Reef Structure
Sea Level Change and Its Effect on Reef Growth
Volcanic Loading and Isostasy
MIDWAY ATOLL (HAWAIIAN ARCHIPELAGO)
James E. Maragos
1 , Donald C. Potts
2
, Barbara Maxfield
1
,
Daria Siciliano
3 , Elizabeth Flint
1
1
U.S. Fish and Wildlife Service, Honolulu, HI, USA
2
University of California at Santa Cruz, Santa Cruz, CA
3
Stanford University, Silver Spring, MD, USA
Introduction
Midway Atoll is a subtropical reef near the northwestern
end of the Hawaiian Archipelago at 28
12
0 N and 177
22
0 W, approximately 2,000 km from Honolulu and
259 km east of the International Date Line. Midway is
an unincorporated U.S. territory and the only island in
the archipelago not a part of the State of Hawai‘i. It is second only to neighboring Kure Atoll, 60 km to the northeast, as the Pacific’s most northerly atoll. Midway is
roughly 9 km in diameter; 40 km
2 in total area; contains
two main islands, Sand (1,200 ha) and Eastern (135 ha);
700
MIDWAY ATOLL (HAWAIIAN ARCHIPELAGO)
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