GEOL 247 Lab 3 (2024)
pdf
keyboard_arrow_up
School
University of Saskatchewan *
*We aren’t endorsed by this school
Course
224
Subject
Geology
Date
Feb 20, 2024
Type
Pages
8
Uploaded by SuperCobra3083
/4 Exercise 1.
(Drawing) Draw the stromatoporoid found at the back
of the lab. Label the structures: mamelon, astrorhiza, pillar, lamellae,
and gallery.
/2 Exercise 2.
(Written answer) What kind of organisms are
stromatoporoids and stromatolites? What features can you use to
differentiate them? What ecological roles do each fulfill?
/4 Exercise 3.
(Drawing) Draw the archaeocyathid found at the back
of lab. Label the structures: outer wall, inner wall, central cavity, and
intervallum. /3 Exercise 4.
(Written answer) What geologic period is this
archaeocyathid specimen from? What is the fossil composed of?
What feature(s) about archaeocyathids allow us to categorize them as
sponges?
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
/2 Exercise 5.
(Written answer) Most sponges are not easily
preserved in the fossil record. Which element of their skeleton can
cross the fossilization barrier? As an example, what part of
Hexactinellida (a type of sponge still around today) would fossilize,
and what is this element of their skeleton composed of?
/12 Exercise 6.
(Drawing) There are three types of corals displayed:
Rugosa, Tabulata and Scleractinia. Draw each of these three
specimens and label the structures. Terms to use for labels (not every
label is applicable to every specimen): epitheca, septa, tabulae,
calice, dissepiment, corallite and/or corallum.
/3 Exercise 7.
(Fill-in-the-blanks) Using your class notes, PBDB, and
the Digital Atlas of Life, fill in the following information on corals.
Rugosa
Tabulata
Scleractinia
Geological Era
Solitary/Colonial
Skeleton Composition
Presence of Septa
Presence of Tabulae
Body Symmetry
/2 Exercise 8.
(Written answer) Reef-building organisms such as
sponges and corals grow in many different forms. What kind of
environmental factors in different zones of a reef influence the form an
organism takes?
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
/2 Exercise 9.
(Diagram) Name the reef zones (labels A to D) and
sketch the shapes of the following coral and sponge forms: domal (or
massive), branching (or columnar), tabular (or platy).
/2 Exercise 10.
(Written answer) Give a short explanation of why you
placed each form where you did, using your previously listed
environmental factors. Additionally, where would you place the algae
forms discussed in lecture?
/1 Exercise 11.
(Written answer) Most modern corals (scleractinians)
possess zooxanthellae. Consider the complexity of symbiotic
relationships and some pros and cons of coral photosymbionts. Do
you think Paleozoic corals also possessed these photosymbionts.
Explain.
Bonus Exercise.
(Drawing, Written answer) Consider the specimen
labelled “Favourite Coral” at the back of the lab. What type of coral is
this? What Era is this from? Draw and label this specimen with the
applicable labels from Exercise 6. How does this specimen differ from
other corals of this type?