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Field Assignment
Part 1
Travis Maynard
Geo-1
Pismo Beach, CA & Coalinga, CA



Pismo Beach, CA is a coastal         A majority of my samples were
town located on the central coast.   located around Coalinga and
Pismo Beach has been inhabited       thirteen miles outside of
for more than 9,000 years by         Coalinga in the Los Gatos
Chumash Indians and became a         Canyon. Coalinga is located in
city in 1840. There are many         the central valley betweem Los
                                     Angeles and San Francisco.
types of rocks in the
                                     Both Coalinga and Los Gatos
area, especially sedimentary
                                     were at one time below sea
rocks because of the large           level and completely covered in
amount of water and erosion that     water because of this there are
takes place. Some of the rocks I     many rock types that are usually
collected came from various          found in coastal regions. Also it
locations in Pismo Beach.            is easy to find rocks that contain
                                     coastal fossils.
Igneous Rocks
• The word Igneous comes from the Latin which means “Fire”
• Igneous rocks form from either magma within the Earth’s
  crust or Lava that has erupted.
• Igneous rocks that form from lava are called extrusive igneous
  rocks.
• Igneous rocks that form from magma are called intrusive
  igneous rocks.
• Igneous rocks that form from magma deep within the Earth
  are called plutonic igneous rocks.
• Igneous rocks are classified by the minerals that are within the
  rock.
I believe this rock to   I believe that this rock is
be Diorite. Diorite is   Gabbro. Gabbro is a the
a plutonic igneous       plutonic version of
rock which is            Basalt. Gabbro is low in
between granite          silica and does not
and gabbro. It           contain quartz. Gabbro is
consists mostly of       mostly hornblende
white plagioclase        magnetite and
feldspar and black       plagioclase.
hornblende.
Metamorphic Rocks
• Metamorphic rocks are formed from changed igneous and
  sedimentary rocks.
• Conditions underground is the cause of change of the igneous
  and sedimentary rocks.
• There are four agents of metamorphism:
• Heat
• Pressure
• Fluids
• Strain
I believe this rock to be Phyllite. I
discovered this rock in Los Gatos
Canyon. Phyllite is a foliated
metamorphic rock that is made of
mostly quartz, sericite mica, and
chlorite. Phyllite is made from
metamorphisized slate.
Sedimentary Rocks
• Sedimentary rocks are rocks that are formed from many
  different types of sediment.
• Sedimentary rocks are formed from many compacted pieces
  of sediment.
• These rocks are formed at the Earth’s surface, usually within
  bodies of water.
• The pieces of sediment that form sedimentary rocks are
  formed from erosion and weathering.
I believe this rock   I believe this rock to
to be red chert.      be conglomerate.
Chert is a fine-      Conglomerate is a
grained               sedimentary rock that
sedimentary rock      is composed of many
composed of           different types of
mineral               sediment that are
chalcedony or         larger than grains of
quartz.               rice.
Works Cited
About Geology - The Complete Guide to Earth Science and Geology. Web.
11 Nov. 2011. <http://geology.about.com/>.

Ball., Jessica. Geology.com: News and Information for Geology & Earth
Science. Web. 01 Dec. 2011. <http://www.geology.com>.

Verhoogen, John. The Earth; an Introduction to Physical Geology. New York:
Holt, Rinehart and Winston, 1970. Print.

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Fieldlab1

  • 2. Pismo Beach, CA & Coalinga, CA Pismo Beach, CA is a coastal A majority of my samples were town located on the central coast. located around Coalinga and Pismo Beach has been inhabited thirteen miles outside of for more than 9,000 years by Coalinga in the Los Gatos Chumash Indians and became a Canyon. Coalinga is located in city in 1840. There are many the central valley betweem Los Angeles and San Francisco. types of rocks in the Both Coalinga and Los Gatos area, especially sedimentary were at one time below sea rocks because of the large level and completely covered in amount of water and erosion that water because of this there are takes place. Some of the rocks I many rock types that are usually collected came from various found in coastal regions. Also it locations in Pismo Beach. is easy to find rocks that contain coastal fossils.
  • 3. Igneous Rocks • The word Igneous comes from the Latin which means “Fire” • Igneous rocks form from either magma within the Earth’s crust or Lava that has erupted. • Igneous rocks that form from lava are called extrusive igneous rocks. • Igneous rocks that form from magma are called intrusive igneous rocks. • Igneous rocks that form from magma deep within the Earth are called plutonic igneous rocks. • Igneous rocks are classified by the minerals that are within the rock.
  • 4. I believe this rock to I believe that this rock is be Diorite. Diorite is Gabbro. Gabbro is a the a plutonic igneous plutonic version of rock which is Basalt. Gabbro is low in between granite silica and does not and gabbro. It contain quartz. Gabbro is consists mostly of mostly hornblende white plagioclase magnetite and feldspar and black plagioclase. hornblende.
  • 5. Metamorphic Rocks • Metamorphic rocks are formed from changed igneous and sedimentary rocks. • Conditions underground is the cause of change of the igneous and sedimentary rocks. • There are four agents of metamorphism: • Heat • Pressure • Fluids • Strain
  • 6. I believe this rock to be Phyllite. I discovered this rock in Los Gatos Canyon. Phyllite is a foliated metamorphic rock that is made of mostly quartz, sericite mica, and chlorite. Phyllite is made from metamorphisized slate.
  • 7. Sedimentary Rocks • Sedimentary rocks are rocks that are formed from many different types of sediment. • Sedimentary rocks are formed from many compacted pieces of sediment. • These rocks are formed at the Earth’s surface, usually within bodies of water. • The pieces of sediment that form sedimentary rocks are formed from erosion and weathering.
  • 8. I believe this rock I believe this rock to to be red chert. be conglomerate. Chert is a fine- Conglomerate is a grained sedimentary rock that sedimentary rock is composed of many composed of different types of mineral sediment that are chalcedony or larger than grains of quartz. rice.
  • 9. Works Cited About Geology - The Complete Guide to Earth Science and Geology. Web. 11 Nov. 2011. <http://geology.about.com/>. Ball., Jessica. Geology.com: News and Information for Geology & Earth Science. Web. 01 Dec. 2011. <http://www.geology.com>. Verhoogen, John. The Earth; an Introduction to Physical Geology. New York: Holt, Rinehart and Winston, 1970. Print.