GY 112L: Earth History Lab

Week 9: Paleozoic Part 3

Instructor: Dr. Douglas W. Haywick

UNIVERSITY OF SOUTH ALABAMA

Today’s Agenda

The Paleozoic Part 3 (Week 9 exercises)

1) Brachiopods 2) Molluscs 3) Alabama Stratigraphy

Brachiopoda

Brachiopod Facts:

Taxonomy: (under review) Phylum: Brachiopoda Class: Inarticulata Class: Articulata

Brachiopoda

Brachiopod Facts:

Taxonomy: Phylum: Brachiopoda Class: Inarticulata Class: Articulata Range: Cambrian-Recent (Inarticulates were first)

Brachiopoda

Brachiopod Facts:

Taxonomy: Phylum: Brachiopoda Class: Inarticulata Class: Articulata Range: Cambrian-Recent Mode of Life: Marine, benthic, filter feeder

Brachiopoda

Brachiopod Facts:

Taxonomy: Phylum: Brachiopoda Class: Inarticulata Class: Articulata Range: Cambrian-Recent Mode of Life: Marine, benthic, filter feeder Mineral composition: calcite, phosphate

Brachiopoda

Brachiopod Facts:

Taxonomy: Phylum: Brachiopoda Class: Inarticulata Class: Articulata Range: Cambrian-Recent Mode of Life: Marine, benthic, filter feeder Mineral composition: calcite, phosphate Fossil Pres.: pristine (sometimes external molds)

The Brachiopod Animal

Inarticulates

The Brachiopod Animal

Inarticulates

Brachiopod Symmetry

Symmetrical across the valves (down the medial line)

Brachiopod Symmetry

Symmetrical across the valves (down the medial line)

Brachiopod Symmetry

Symmetrical across the valves (down the medial line)

Articulate Brachiopods

Brachiopod Symmetry

Symmetrical across the valves (down the medial line)

Articulate Brachiopods

Brachiopod Symmetry

Not symmetrical between the valves

Brachiopod Symmetry

Not symmetrical between the valves

Yes No

Mollusca (Mollusks)

Mollusk Facts:

Taxonomy: Phylum: Mollusca

Mollusca (Mollusks)

Mollusk Facts:

Taxonomy: Phylum: Mollusca Class: Amphineura Bivalvia Gastropoda Cephalopoda Order: Nautiloidea Ammonoidea Belemnoidea

Mollusca (Mollusks)

Mollusk Facts:

Taxonomy: Phylum: Mollusca Class: Amphineura Bivalvia Gastropoda Cephalopoda Order: Nautiloidea Ammonoidea Belemnoidea Range: Gastropoda (Cambrian-Recent) Bivalvia (Cambrian-Recent) Cephalopoda (Cambrian-Recent)

Mollusca (Mollusks)

Mollusk Facts:

Taxonomy: Phylum: Mollusca Class: Bivalvia Gastropoda Range: Gastropoda (Cambrian-Recent) Bivalvia (Cambrian-Recent) Mode of Life: Marine, non-marine, terrestrial, filter feeder, scavenger, predators

Mollusca (Mollusks)

Mollusk Facts:

Taxonomy: Phylum: Mollusca Class: Bivalvia Gastropoda Range: Gastropoda (Cambrian-Recent) Bivalvia (Cambrian-Recent) Mode of Life: Marine, non-marine, terrestrial, filter feeder, scavenger, predators

Mollusca (Mollusks)

Mollusk Facts:

Taxonomy: Phylum: Mollusca Class: Bivalvia Gastropoda Range: Gastropoda (Cambrian-Recent) Bivalvia (Cambrian-Recent) Mode of Life: Marine, non-marine, terrestrial, filter feeder, scavenger, predators Mineral composition: calcite, aragonite

Mollusca (Mollusks)

Mollusk Facts:

Taxonomy: Phylum: Mollusca Class: Bivalvia Gastropoda Range: Gastropoda (Cambrian-Recent) Bivalvia (Cambrian-Recent) Mode of Life: Marine, non-marine, terrestrial, filter feeder, scavenger, predators Mineral composition: calcite, aragonite Fossil Pres.: pristine. molds, casts, chalky

The Mollusk Animal

Bivalves

The Mollusk Animal

Gastropods

Bivalve Symmetry

Symmetrical between the valves

Bivalve Symmetry

Symmetrical between the valves Not across the valves

Bivalve vs Brachiopod Symmetry

Bivalve: Symmetrical between the valves

Brachiopod: Symmetrical across the valves

Bivalve Symmetry

Beware Scallops and Oysters

scallops look symmetrical across the valve but they are not

oysters are not symmetrical at all

Alabama Stratigraphy and Rock Suites

Collections of Paleozoic rocks from our fair state

Alabama Stratigraphy and Rock Suites

Paleozoic rocks

Alabama Stratigraphy and Rock Suites

Paleozoic rocks

Bonus Question: Color Paleozoic rock outcrop areas

Alabama Stratigraphy and Rock Suites

Rocks this week: a collection of specimens from northern Alabama (including Red Mountain) which is hematite (iron ore).

Lab Time

GY 112L: Earth History Lab

Week 9: Paleozoic Part 3

Instructor: Dr. Doug Haywick dhaywick@southalabama.edu

This is a free open access lecture, but not for commercial purposes. For personal use only.