WHO WHEN WHAT WHY/HOW

pointdepressedMechanics

Feb 22, 2014 (3 years and 5 months ago)

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WHO

WHEN

WHAT

WHY/HOW

ABRAHAM ORTELIUS

1596

PROPOSED THAT THE
CONTINENTS HAD
ONCE BEEN JOINED,
AND DRIFTED APART

JIG
-
SAW FIT OF SOUTH
AMERICA AND AFRICA

NICOLAUS STENO

1669

LAW OF
SUPERPOSITION


OLDER ROCK IN LAYERS
FURTHER DOWN

CHANGES IN
SEQUENCES OF

SEDIMENTATION OF
MOUNTAINS IN ITALY

JAMES HUTTON

1785

UNIFORMITARIANISM


EARTH’S LANDSCAPE
DEVELOPED THROUGH
LONG, SLOW
PROCESSES, AND
EARTH IS MUCH OLDER
THAN PREVIOUSLY
THOUGHT

SEDIMENTATION
LAYERING IN
LANDFORMS,
EROSION/WEATHERING
PROCESSES

ALFRED
WEGNER

1912

SUPERCONTINE
N
T
THEORY
(CONTINENTAL DRIFT
THEORY)


THE
CONTINENTS WERE
ONCE PART OF A
SUPERCONTINENT
(PANGAEA) THAT
DRIFTED APART

FIT OF SOUTH AMERICA
AND AFRICA, FOSSIL
EVIDENCE ON
OPPOSING SHORES OF
S. AMERICA AND
AFRICA, SIMILAR ROCK
LAYERIN
G IN
DIFFERENT
CONTINENTS

ARTHUR HOLMES

1929

CONVECTION
CURRENT THEORY


THE MENTLE OF THE
EARTH HAS
CONVECTION
CURRENTS THAT ACT
LIKE A CONVEYOR BELT
FOR THE CONTINENTS

NOT MUCH EVIDENCE
AT THE TIME
“SPECULATIVE”

HARRY HESS

1962

SEA FLOOR SPREADING
THEORY


THE OCEAN
FLOOR MOVES AND
CARRIES CONTINENTS
WITH IT AS IT EXPANDS
FROM A CENTRAL
POINT

SOUNDING DATA TO
MAP THE SEA FLOOR,
LATER ROCK DATING
TO SHOW YOUNGER
ROCKS AT THE MID
-
OCEAN RIDGES

DAN MCKENZIE

1968

THEORY OF PLATE
TEC
TONICS


COMBINATION OF
CONTINENTAL DRIFT
THEORY AND SEA
-
FLOOR SPREADING
THEORY

COMBINED PREVIOUS
DATA AND NEW
OBSERVATIONS
,
MATHEMATICAL
MODELS