0401temp_PztoPangaea-stu

0401temp_PztoPangaea-stu -...

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Unformatted text preview: The
Early
Paleozoic
Southwest EARTH
SCIENCE
in ARIZONA
and
the SOUTHWEST Chuar
Butte,
Grand
Canyon,
Arizona (S.
Reynolds) (U.S.
Geological
Survey,
2007) Near
the
end
of
the
Proterozoic
Eon
(around
550
Ma) Equ ator 
at
t hat
 time Laurentia Hi gh d lan s? Present‐day Southwest (R.
Blakey) The
Early Paleozoic
Southwest Gondwana (T.T.F.N.) 2 The
long‐lived
passive
margin Laurentia Cambrian
Period,
500
Ma (R.
Blakey) The
Early Paleozoic
Southwest 3 W Passive
margin E W (Reynolds,
Johnson, Kelly,
Morin,
&
Carter,
2010) E Rising
seas
flooded
the low‐lying
margin, depositing
sediments The
Early Paleozoic
Southwest (Reynolds,
Johnson,
Kelly,
Morin,
&
Carter,
2010,
after
Blakey) 4 The
seas
came
in,
the
seas
went
out The
Early Paleozoic
Southwest (Baldridge,
2004,
after
Sloss) 5 Phanerozoic
transgressions
of
seas
onto
North
America are
recorded
in
sedimentary
sequences Paleozoic Stanley (2005) Sequences are separated by major regional unconformities (shown in grey) Baldridge (2004), after Sloss (1965) The
Early Paleozoic
Southwest 6 The
Paleozoic
record
in
the
Grand
Canyon Know the Canyon’s history; study stratified rocks that
(are) made by time. Kaibab
Limestone Toroweap
Formation Coconino
Sandstone Hermit
Formation Supai
Group Surprise
Canyon
Formation Redwall
Limestone Temple
Butte
Limestone Muav
Limestone Bright
Angel
Shale Tapeats
Sandstone The
Early Paleozoic
Southwest 7 Chuar
Butte,
Grand
Canyon Muav
Limestone Bright
Angel
Shale Tapeats
Sandstone S.
Reynolds The
Early Paleozoic
Southwest 8 Cambrian
transgression
(E.
McKee,
1945) Each
formation
gets
younger
to
the
east 




 Environments
migrated
eastward
 through
time
=
transgression in
the
Cambrian
Period Stanley
(2005) The
Early Paleozoic
Southwest 9 Laurentia
at
500
Ma
(Late
Cambrian) Sauk transgression onto passive margin Paleogeographic
map
by
R.
Blakey,
NAU The
Early Paleozoic
Southwest 10 Cambrian
Southwest,
during
Sauk
transgression The
Early Paleozoic
Southwest Paleogeographic
map
by
R.
Blakey,
NAU 11 The
Great
Unconformity
in
Grand
Canyon Tapeats
Sandstone Paleoproterozoic crystalline basement
rocks Tapeats
Sandstone The
Early Paleozoic
Southwest 12 The
Great
Unconformity,
East
Verde
River
valley
near
Payson,
Arizona Tapeats
Sandstone Paleoproterozoic intrusive
rocks (granite
and
diorite) The
Early Paleozoic
Southwest 13 Ordovician
Southwest,
at
start
of
Tippecanoe
transgression Much
of
today’s
Southwest stayed
high
and
dry Paleogeographic
map
by
R.
Blakey,
NAU The
Early Paleozoic
Southwest 14 Silurian
Southwest Much
of
today’s
Southwest remained
high
and
dry Paleogeographic map by R. Blakey, NAU The
Early Paleozoic
Southwest 15 Ordovician
and
Silurian
rocks
are
absent
in much
of
Arizona The
Early Paleozoic
Southwest 16 Devonian
Southwest,
during
Kaskaskia
transgression Paleogeographic
map
by
R.
Blakey,
NAU The
Early Paleozoic
Southwest 17 Peach
Springs,
Colorado
Plateau,
Arizona:
Devonian
carbonates (S.
Reynolds) The
Early Paleozoic
Southwest 18 Euramerica
at
345
Ma
(Early
Mississippian) Antler orogeny Still
inundated
by Kaskaskia transgression Look
out! Gondwana returns Paleogeographic
map
by
R.
Blakey,
NAU The
Early Paleozoic
Southwest 19 Mississippian
Southwest,
during
Kaskaskia
transgression Paleogeographic map by R. Blakey, NAU The
Early Paleozoic
Southwest 20 The
Early Paleozoic
Southwest 21 (Baldridge, 2004, after Beus, 1990) Redwall The
Early USGS Paleozoic
Southwest 22 Mississippian Redwall
Limestone Devonian Temple
Butte
Formation The
Early Paleozoic
Southwest S.
Reynolds 23 Assembly
of
Pangaea
at
320
Ma
(Earliest
Pennsylvanian) Euramerica Absaroka transgression Gondwanaland Paleogeographic
map
by
R.
Blakey,
NAU The
Early Paleozoic
Southwest 24 Formation
of
the
supercontinent
Pangaea Early
Permian
Period 280
Ma Present‐day
Southwest (Reynolds,
Johnson,
Kelly,
Morin,
&
Carter,
2010,
after
Blakey) The
Early Paleozoic
Southwest 25 ...
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