Check out this month's On the Web links, your connection to earth science friendly Web sites. The popular Geomedia feature is now available by topic.
Movies: Teaching scientists
to be screenwriters
Books: A deep-sea dream: A review of Descent: The Heroic Discovery of
the Abyss
Maps: Mapping the glacial history of Connecticut
The AFI Catalyst Workshop will be held again
next summer, with applications accepted this spring.
Links:
American
Film Institute Catalyst Workshop information
"Earthquakes,
climate change and reel disasters," Geotimes, September 2004
![]() by Brad Matsen. Pantheon, 2005. ISBN 0 3754 2258 7 Hardcover, $25.00. |
Brad Matsen begins his new book Descent: The Heroic Discovery of the Abyss
with his pilgrimage to Bathysphere, the 4.5-foot-long cast-steel sphere
used for the first deep-sea dives in the early 1930s. The sphere was put on
display in the New York Aquarium on Coney Island in 1957, and as far as Matsen
knew, the vessel was still there. When he arrived, he found the worlds
first deep submergence vehicle sitting in a scrap storage yard beneath the Cyclone
roller coaster, a sight Matsen likens to finding the Mercury space capsule in
a flea market.
In the presence of Bathysphere, Matsen could imagine its creators William Beebe
and Otis Barton crouching together in the dark during their 16 dives together,
and marveled at the courage of these two men to be the first to descend into
the abyss, connected to a ship at the surface by a 0.875-inch-thick cable. What
started as a dream for both of these men became the beginning of modern deep-ocean
exploration. Their pioneering discoveries have inspired oceanographers ever
since.
A variety of deep submergence vehicles, both manned and remotely operated, now
are used every day in oceanographic research and by industry. Alvin, the self-propelled
manned deep submersible operated by the Woods Hole Oceanographic Institution,
has made more than 4,100 dives and taken more than 8,000 people to the ocean
floor since being commissioned in 1965. In 1977, researchers aboard Alvin found
strange animal life that they postulated was chemosynthetic, living on the seafloor
near warm water vents on the Galapagos Rift. This discovery was the beginning
of systematic multidisciplinary studies of mid-ocean spreading ridges by geologists,
biologists, chemists and physicists. Exotic new species of tubeworms, crabs,
shrimp, clams, mussels and microbes have since been observed at hydrothermal
vent sites on mid-ocean ridges in the Pacific, the Atlantic and, most recently,
the Arctic oceans.
It is now hard to imagine that until Beebe and Bartons dives into the
Atlantic Ocean near Bermuda from 1930 to 1934, no human had ventured more than
a few hundred feet beneath the waves. Bathysphere took the pair down 2,200 feet
during a live radio broadcast, to 2,510 feet for their famous half-mile
down dive, and later to 3,028 feet, the end of their 3,500-foot-long cable.
Barton and Beebe reached record-breaking depths, and Beebes careful observations
of new species of marine life, along with Bartons attempts at photographing
the world outside their sphere, piqued scientific interest and controversy for
many years.
Matsen brings their story to life in his thorough book and captures the innovation,
excitement and danger of exploring the unknown deep sea. He creates a compelling
story compiled from the many records of the time. Both Beebe and Barton wrote
autobiographies, and Beebe was a particularly prolific writer. He kept detailed
journals throughout his life, and published 21 books and hundreds of scientific
and popular articles. The dives coincided with the beginning of the age of mass
media and celebrity, when people living through the early years of the depression
could not get enough of heroes and celebrities. Beebe and Barton became internationally
famous and numerous newspaper and magazine articles, radio broadcasts and lecture
transcripts chronicled their adventures.
Theirs was an unlikely and complex partnership that never grew into a friendship.
Yet, the discoveries made by Beebe and Barton probably would not have been possible
for many years had they not joined forces. Oceanography was a rapidly growing
science after the systematic observations of the Challenger oceangoing
research vessel in 1872. The atmosphere of fame and fortune, and the excitement
of a new science, set both mens imaginations into high gear.
Barton, a young engineer with an Ivy League education and Boston Brahmin roots,
was obsessed with his dream of becoming a famous ocean explorer after devising
a way to make a helmeted dive at the age of 16. Beebe was already an established
naturalist with the New York Zoological Society and was attempting a mid-career
shift to oceanography after his own helmeted dive in the Galapagos. Although
a controversial figure for his lack of formal education and his personal exploits
during the Roaring 20s, Beebe was equally famous for his serious tropical
ecological work and his popular books that spiced up the science with romance
and adventure.
Beebe and Barton lived when the era of the gentleman scientist was beginning
to pass, but before the days of government-funded science began. Their fame
and reputation, Beebes in particular, gave them access to a society of
wealthy patrons whose funding was crucial for their expeditions. They also lived
during a time when women were enjoying a new freedom after the constraints
of Victorian society and after gaining the right to vote. It is notable that
several women also participated in the expeditions because modern women oceanographers
were generally not allowed on research vessels until the late 1960s. Two of
these women, Gloria Hollister and Jocelyn Crane, dove to more than 1,000 feet
in Bathysphere. Hollisters dive set a female record, at 1,208 feet,
that lasted for 30 years.
Beebe and Barton dreamed of the ocean and had the courage to dive into its depths
in their newly designed and untested Bathysphere, which now is on display at
the New York Aquarium. These two men were pioneers whose efforts resulted in
the new scientific field of deep-ocean exploration, which 70 years later, continues
to yield new and exciting discoveries with every new dive. Matsens book
will put any reader in the midst of the dream and how it became reality.
A new map portrays the geologic deposits and features formed by the last two
continental ice sheets that swept across Connecticut and Long Island Sound in
the Middle and Late Pleistocene, some 180,000 to 15,000 years ago. The map,
produced by the U.S. Geological Survey in cooperation with the Connecticut Geological
and Natural History Survey, updates four decades of detailed mapping on land,
and incorporates analysis of deep seismic profiles in Long Island Sound Basin,
where it extends offshore as a 3-D map of the deposits beneath the sound.
Glacial till deposits of the last (Late Wisconsinan) ice sheet from 25,000 years
ago blanket the state. The map also marks retreat positions of the edge of the
ice sheet across today’s shoreline.
Glacial meltwater deposits provide detailed information on the disappearance
of the last ice sheet and the depositional processes operating around its margin.
A total of 204 local units show the distribution of glacial rivers and lakes,
large and small, that flooded valleys in front of the retreating ice.
In particular, the map shows all delta and varved-clay deposits of the famous
large glacial lakes Hitchcock and Middletown in the Connecticut River valley,
and Lake Connecticut in Long Island Sound Basin. Ice-margin retreat positions
show the melting back of the ice edge from 19,000 radiocarbon years before present
at the recessional moraine on Long Island, N.Y., to 15,000 years before present
in the northern Connecticut River valley.
The offshore map units reveal the history of Long Island Sound: deep glacial
scour by the last two ice sheets; ice-front, deltaic and lake-clay sedimentation
in Lake Connecticut; drainage of the lake and stream erosion; and the latest
marine transgression into the basin. Sandy delta sediments deposited in this
marine embayment date from the draining of Lake Hitchcock to the north. This
event ties the onland geologic history to the offshore record, and to the tilting
of the Earth’s crust in response to unloading of the melting ice sheet.
Along with its companion “Surficial Materials Map of Connecticut,” the Quaternary-map
database already has been used by state and federal agencies to derive statewide
maps and analyses of sand and gravel construction aggregate, indoor radon potential
hazard, flood-flows of Connecticut rivers and geohydrologic factors effecting
source-water areas for bedrock water wells.
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