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LOUISIANA Rocks and Minerals

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LOUISIANA Rocks and Minerals Rebecca Tedford and Dr. Sophie Warny The Mission of the LSU Museum of Natural Science Acquisition, Preservation, and Study of research ... – PowerPoint PPT presentation

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Title: LOUISIANA Rocks and Minerals


1

LOUISIANA Rocks and Minerals Rebecca Tedford and
Dr. Sophie Warny
2
The Mission of theLSU Museum of Natural Science
  • Acquisition,
  • Preservation, and
  • Study
  • of research collections to generate
    knowledge of
  • Regional and global biodiversity,
  • Geological history, and
  • Human history and prehistory
  • for the benefit of the people of the
    state, the nation, and the world.

3
Divisions of the LSU MNS
  • 7 main fields of RESEARCH
  • Ornithology (Birds)
  • Genetics
  • Ichthyology (Fishes)
  • Mammalogy
  • Herpetology (Reptiles and Amphibians)
  • Paleontology
  • Anthropology (Archaeology and Ethnography)
  • EDUCATION

4
  • THE PALEONTOLOGY
  • COLLECTIONS

5
Invertebrate Paleontology Palynology Dr. Sophie
Warny
What is palynology?
  • Palynomorphs
  • both plant and animal structures
  • microscopic in size (from about 5 µm to about
    500 µm)
  • made of compounds that are highly resistant to
    decay
  • abundant in most sediments and sedimentary rocks
  • can be extracted by chemical processing (acids
    digestion sieving)

Spores Pollen grains
Dinoflagellate cysts Acritarchs
Leiospheres
6
Vertebrate Paleontology Dr. Judith Schiebout
  • Collections
  • Over 17,000 specimens from over 1000 localities
    with emphasis on Louisiana. 
  • Research statement Dr. Schiebout's focus is on
  • Paleoecology
  • Biostratigraphy and paleogeography of southern
    North America and China in the Tertiary
  • Early and middle Tertiary mammals
  • The Cretaceous-Tertiary and Paleocene-Eocene
    transition
  • Louisiana fossil vertebrates, particularly in
    the Miocene

7
  • Large collection of Tertiary fossils including
    this whale
  • Vertebrae and ribs of the Eocene whale
    Basilosaurus
  • at Montgomery Landing, Louisiana.
  • Large collection of middle Tertiary mammals from
    the Fort Polk region
  • Large collection of Tertiary mammals from Tunica
    Hills,
  • such as early elephant, rhino, hedgehog and camel
    relatives.

8
2. Associated Collections Minerology And
Petrology and Louisiana Geological Survey
Mineral and rock collections
On-line resources
9
Rock and Mineral Collections located in
Howe-Russell Geoscience Complex
  • Available upon request
  • LSU Geology Loan trunk

10
Louisiana Geological Survey (LGS) on-line
resources
Down-loadable Stratigraphic and Geologic maps
11
3. FIELD TRIP PRACTICAL DETAILS
12
General Info Tours
Monday-Friday 800 am - 400 pm
FREE!
Scheduling Materials Rules Parking
13
5. BACKGROUND AND HANDS-ON ACTIVITIES
  • ACTIVITIES
  • Making a Geologic Map of Louisiana
  • SOAR Activities
  • Rocking Out
  • Sand Secrets
  • Mining for MMMMinerals
  • Investigating the Layer-cake earth

14
Geology The Basics
What is Geology? Study of the origin, history,
and stucture of the Earth as recorded in the rock
record. The Earth is composed of different
types of rocks and minerals.
Geologists are the scientists who study these
rocks and minerals.
15
MINERALS
  • Naturally occurring
  • man-made substances would not be considered a
    mineral
  • Inorganic solid
  • - Inorganic substances are those that are not
    living or formed by living processes
  • Specific chemical composition
  • Unique crystal structure and properties
  • Atoms are arranged in a orderly, repeated pattern
  • Physical properties include color, luster,
    streak, cleavage, etc.

16
Rocks
Rocks- An aggregate solid of one of more minerals
in different proportions. Chocolate chip cookie
analogy Cookie rock Ingredients
minerals Oven Earths heat
Rocks are divided into three different types
based on how they are formed Igneous,
Metamorphic, and Sedimentary
17
Igneous The word, igneous means from fire or
heat. Igneous rocks form when molten lava
(magma) cools and turns to solid rock. There are
two types- Intrusive- cools slowly inside the
Earth (Examples Granite). They have large
mineral grains Extrusive- Magma that reaches the
earths surface and cools relatively quickly.
(Examples- Basalt, obsidian, pumice). The
mineral grains are small.
Note MAGMA- inside the Earth, LAVA- outside of
the Earth
18
Metamorphic These are rocks that have changed
(Examples- marble, schist) From the Greek words
meta and morph which means to change form.
They were originally sedimentary or igneous rocks
that changed due to heat and pressure often from
eh movement of the Earths crust. Sedimentary Rock
s composed of grains of clay, mud, sand, and
dirt. (Examples- sandstone, limestone) These
form when sediments are weathered and deposited
as layers into streams, oceans, rivers, and lake.
After thousands and millions of years the weight
and pressure of all these sediments eventually
turn them into sedimentary rocks!
19
Activity 1 Making a Geologic map of Louisiana
GEOLOGIC MAPS Definition Map designed to show
the distribution of geologic features such as
different rock types and faults in the area.
  • Only show geologic units that are exposed on the
    surface
  • Different colors symbolize a different geologic
    unit

This activity can be used in conjuction with
the Fossil gravel activity
20
Generalized Surface Geology of Louisiana http//ww
w.lgs.lsu.edu/deploy/uploads/gengeotext.pdf

Holocene Alluvium ( youngest rocks) These are
the abundant sand and clay riverine deposits
deposited by the Mississippi, Ouachita, Red, and
other rivers within coastal environments. These
represent over 50 of surface exposed
rocks. Pleistocene terraces These deposits
consist of sand, gravel, and mud that are
remnants of preexisting riverine flood plains.
They are found near modern rivers and coastal
plains. 25 of surface exposed rocks. Tertiary
rocks ( oldest rocks) These are associated with
rver flood plains, coastal plains, and shallow
sea environments that occurred due to fluctuating
sea levels. Oldest rocks are Late Cretaceous
marine rocks (70-82 million years old) outcrop in
Bienville parish. These are highly fossiliferous
marls and chalks.
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