Sedimentary Petrology

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The following quiz assumes that you have the background knowledge from GLGY 491. For additional questions specific to organisms, please check Geology 491 materials. Most concepts related to 491 class has been omitted from this quiz.

Attention: Application questions

Please be aware that you may come across difficult questions. They are usually not directly from one particular lecture but rather application of principles form several different lectures and labs. In this particular class, you are expected to solve this type of questions for the lecture/lab midterms and the finals. It is not my intention to make this quiz questions hard like a jackass.

Geology (GLGY 461-UCAL) Midterm

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Question 1

The dendroid stromatoporoids such as Amphipora and Euryamphipora are characteristic of what type of carbonate environment?

A	Shallow internal platform biostromes
B	Outer platform margin biostromes
C	Open-water supertidal flats
D	Open-water mud mounds
E	Platform slopes

Question 2

What is the most abundant sedimentary rock by volume in the Earth's crust?

A	Siliciclastic sandstones
B	Limestones
C	Siliciclastic mudstones
D	Dolostones
E	Phosphorites
F	Halites

Question 3

Tabulate and rugose corals are mostly __I__ while scleractinian corals are mostly __II__.

A	A. siliceous B. calcitic
B	A. calcitic B. siliceous
C	A. colonial B. solitary
D	A. calcitic B. aragonitic
E	A. aragonitic B. calcitic

Question 4

Stromatoporoids are found in bulbous colonial forms, which is unique diagnostic property.

A	False, they were found in laminae, pillars and astrorhizae forms.
B	False, they were found in mounded laminae forms.
C	True

Question 5

Is Al₂SiO₅ a mineral?

A	Yes it is a mineral.
B	No, it is a synthetic material.
C	No, it is only the chemical formula for a mineral.
D	No, it is neither a mineral nor a valid chemical formula.

Question 5 Explanation:

It is a valid chemical formula for kyanite. But since no mineralogical info attached to it, therefore it is a valid chemical formula, but may or may not be a mineral.

Question 6

What is diagensis?

A	The process in which constituents were broken down during the burial to form new minerals in the sediment.
B	The process in which rocks were cooled down after a burial process to from new rocks.
C	The process in which constituents were combined to form metamorphic rocks.
D	The process in which constituents were transported from the initial deposition location to a basin for burial.

Question 7

Which organisms would have complex prismatic skeletal microstructure?

A	Foraminifera
B	Brachiopods
C	Molluscs
D	Echinoderms

Question 8

Rocks in which organisms build a rigid framework is known as...

A	Rudstones
B	Framestones
C	Bindstones
D	Bafflestones
E	Floatstones

Question 9

This type of microstructure results in very strong shells.

A	Multiple chemical elements within growth lines
B	Cross-lamellar
C	Double-crystal system
D	Foliation

Question 10

What causes the pinching in-out on crossed lamellar structure?

A	Changes in chemical composition during each growth cycle.
B	Overlap of 1-st and 2-nd Order lamellae.
C	Foliation grade differences during each growth cycle.
D	Longitudinal deformation due to stresses during sedimentation.
E	Due to their orientation to the cut surface of the thin section.

Question 11

Which of the following microstructures can be found only on molluscs shells?

A	Foliated structures
B	Single crystal structures
C	Composite prismatic structures
D	Fascicular fibrous structures

Question 12

Shell growth lines always propagates in the direction of the growth.

A	False
B	True

Question 13

How would you distinguish between the 1^st and 2^nd Order lamellar structures in aragonite based shells?

A	Pore/void space: the 1-st Order structures have less void space.
B	Pattern of the cross; the 1-st Order structures V-shaped.
C	Pattern of the cross; the 2-st Order structures V-shaped.
D	Pore/void space: the 2-st Order structures have less void space.
E	Shape and size; the 2-st Order structures are larger.
F	Shape and size; the 1-st Order structures are larger.

Question 14

In thin section, what feature can be used to positively identify ("for sure") the brachiopod shells/shell fragments?

A	Several layers of foliated or normal prismatic structures.
B	At lest two layers with 1-st and 2-nd Order aragonitic crossed-lamellar layers. Hint: Nope; this is for molluscus.
C	Several layers of complex and composite prismatic structures. Hint: Nope; this is for molluscus ONLY.
D	Homogeneous prismatic structures with no deformation. Hint: Nope; this is mostly for forminifera and molluscs.
E	At least two layers of non-deformed single crystal structures. Hint: Nope; this is mostly for echinoderms.

Question 15

In Geology, what are the variables that contributes to secular variations in carbonate mineralogy?

A	Change in abundance of chemicals.
B	Change in abundance of organisms in a micro-region.
C	Change in abundance of organisms in a macro-region.
D	Change in temperature and pressure.
E	Change in the rate at which the burial of sediments occurs.
F	Change in temperature only.

Question 16

Actinostroma, a laminar stromatoporoid is dominant in which for the following carbonate platform setting?

A	Outer platform margin bioherms
B	Platform slopes
C	Open-water mud mounds
D	Supertidal flats
E	Shallow internal platform biostromes

Question 17

Which of the following statement is false about the Standard Facies Zones model?

A	It dose not consider effects of sea level changes or climate controls.
B	It is an ideal model of platform environment that will work for most areas of Earth.
C	It was first published in 1975 by Wilson.
D	It is often used for pleobilogical stratigraphic analysis.

Question 18

Standard Facies Zones model, each Facies Zone is defined based on condition(s)?

A	Common lithofacies.
B	Depositional setting, sediment type, biota and common lithofacies.
C	Variations in the global biological and lithological diversity.
D	Common lithofacies and biological characteristics.
E	Nature of the tidal flat, lagoonal faces, shallow ramp and deep shelf ramp.

Question 19

__I__ corals are reef builders and __II__ corals are not reef builders.

A	I. Ahermatypic II. Hermatypic
B	I. Rugose II. Brain
C	I. Hexacorallia II. Brain Hint: Both are reef builders.
D	I. Brain II. Hexacorallia Hint: Both are reef builders.
E	I. Hermatypic II. Ahermatypic

Question 20

What is the ideal depth for corals to thrive?

A	Below 100 m
B	Between 200 m and 300 m
C	Around 300 m
D	Around 200 m
E	Between 150 m and 200 m

Question 21

Modern Stromatoporoidea are reef builders.

A	True
B	False; they are solitary organisms.
C	False; they are an extinct class of organisms.

Question 22

What facies zone that developed behind barriers and adjoined to Tidal flat facies?

A	Deep Tidal Flat Facies
B	Shallow Ramp Facies
C	Deep Basin Facies
D	Deep Shelf Facies
E	Lagoonal Facies

Question 23

Modern peloids are common in...

A	low energy shallow tidal environments.
B	high energy slope environments.
C	high energy deep tidal environments.
D	low energy reef/ramp environments.

Question 24

This type of peloids originated from disintegration of calcareous algae.

A	Biotic
B	Alteration of grains
C	Reworked lithofied clasts
D	In-situ formation

Question 25

Which of the following can be used as an identifier for peloidal rocks primarily composed of cyanobacteria?

A	Large pour spaces caused by entrapment of gaseous substance.
B	Large volume of spherical/sub-spherical shaped peloids.
C	Presence of bio-chemicals and organic matter.
D	Large volume of elongated peloids.
E	Presence of destructive micritization.

Question 26

The abundance of peloidal rocks and sediments in an area is an indication of....

A	high global biological activities due to abundance in nutrients. Hint: Think again; usually "abundance of peloidal rocks" found in specific areas in specific geologic time.
B	very high energy environment.
C	Presence of biotic peloids as opposed to other types.
D	high local biological activities due to abundance in nutrients.
E	very low energy environment.

Question 27

In a thin section, if the size and shape of pelolids are almost the same (homogenous), then it is most likely originated from biotic matters.

A	False; because it is an indication of reworked lithofied clasts of carbonates origin.
B	False; because it is an indication of altered grains forming micritized peloids.
C	True
D	False; because it is an indication of in-situ formations.

Question 28

Biochemical dissolution by microbes can be best described as...

A	cyanobacterial destruction.
B	destructive micritization.
C	microborings.
D	constructive micritization.

Question 29

What are superficial ooids?

A	Thin cortex very thick cortex and innumerable layers.
B	Thin cortex very thin cortex and 1-3 counted layers.
C	Ooids with very thin cortex.
D	Ooids with very thick cortex.
E	Thin cortex very thin cortex and 2-4 counted layers.

Question 30

In order for ooids to from, which of the following conditions must be true?

A	Usually have a nuclei.
B	Presence of nuclei and supersaturated water with respect to calcite.
C	Presence of nuclei and undersaturated water with respect to calcite.
D	Bottom agitation, presence of nuclei and grain degradation.

Question 31

According to the study of ooid shoals in Bahamas, the grains are well sorted...

A	at the points of flow convergence.
B	at the asymmetric surfaces.
C	at the trough of the dunes.
D	at the peak of the crest (peak) of the dunes.
E	along the troughs of parabolic bars.

Question 32

Which of the statements are correct about algae?

A	Red algae are adapted to deeper water environments and they absorbs blue light.
B	Green algae are adapted to shallow water environments and they absorbs yellow light.
C	Red algae are adapted to deeper water environments and they absorbs red light.
D	Blue algae are adapted to deeper water environments and they absorbs blue light.
E	Blue algae are adapted to deeper water environments and they absorbs red light.
F	Green algae are adapted to deeper water environments and they absorbs red light.
G	Green algae are adapted to deeper water environments and they absorbs blue light.

Question 33

Green algae are...

A	....exclusive to marine water environments.
B	...exclusive to fresh water environments.
C	...adapted to deep water environments.
D	...were exclusive to fresh water environments during Carboniferous and modern day they are exclusive to marine water environments.
E	...most abundant in shallow, protected environments.

Question 34

What type of algae would thrive in high turbidity waters?

A	All types (Green, Blue and Red)
B	Blue
C	Red
D	Green

Question 34 Explanation:

This is an application of knowledge type question. Ask yourself; "What type requires the least amount of sunlight?".

Question 35

Which of the following statements are false about Calcareous algae?

A	This group includes both benthic and planktonic organisms that have the ability to photosynthesize.
B	They are important sediment produces and reef builders.
C	They are very important for economic resources such as diamond and gold ores.
D	Some of them are capable of secreting or depositing carbonate around their body.
E	They can be in several depositional settings such as marine, fresh-brackish water ponds, tidal flats and shallow sandy bottoms.

Question 35 Explanation:

Diamond ores are associated with kimberlite pipes not organic depositions.

Question 36

Which phylum the Codiaceae family belongs to?

A	Rhodophyta
B	Chrysophyta
C	Cynaophyta
D	Chlorophyta

Question 37

What type of organisms would you expect to find in the Mariana Trench?

A	Blue algae
B	Red algae
C	Green algae
D	Yellow algae

Question 37 Explanation:

Low light conditions favours red algae. While not much research as been done into this, it is suggested by Geologists, red algae are probably the most common organisms in deep waters.

Question 38

What is the ideal environment for bule-green stromatolites?

A	Restricted marine bays and lagoons
B	Reef fronts
C	Open marine bay shelf lagoons
D	Open marines
E	Tidal flats

Question 39

The central zone of marine green algae is known as __I__ and the peripheral zone known as __II__.

A	I. spinal core II. external core
B	I. cortex II. medulla
C	I. medulla II. cortex
D	I. central core II. outer core

Question 40

During which time period Stromatolites were most abundant?

A	Ediacaran
B	Carboniferous
C	Cretaceous
D	Cenozoic
E	Paleozoic

Question 41

The growth of stromatolites were highly depended on what factor(s)?

A	Sunlight and availability of calcareous fluids
B	High energy water currents
C	Sunlight and moisture
D	Sunlight and high energy water currents
E	Sunlight

Question 42

Which of the following statements are true about marine diagenesis?

A	Sediments could undergo marine diagenesis as long as water is present.
B	CCD or carbon compensation depth is the depth in which the calcite start to become unstable. Hint: Nope; that would be Lysoclines
C	The partial pressure of CO2 is very high at shallow depths; leads to good cementation.
D	The best cementation processes occurs at shallow waters such as at the shelf or slopes.
E	Large portion of the mixing zone is in the marine diagenetic area.

Question 43

__I__ are adapted to shallow waters while __II_ are adapted to deeper waters.

A	I. Blue II. green
B	I. Red II. green
C	I. Green II. red
D	I. Yellow II. green

Question 44

Stromatoporoids can be differentiated from Stromatolites because Stromatoporoids have...

A	layering.
B	zoecias.
C	pillars.
D	alternating sediment-organic matter layers.
E	lamination.

Question 45

Stromatolites are deposits of cyanobacteria.

A	False
B	True

Question 45 Explanation:

They are deposited from cyanobacteria, but not the organism itself.

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Credits: Based on the excellent class notes provided by, Dr. Rudi Meyer during Winter 2014.
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Sanuja Senanayake

Geology 461-University of Calgary

Sedimentary Petrology

Go to: Final Exam

Geology (GLGY 461-UCAL) Midterm

Standing on the shoulders of giants

Sedimentary Petrology

Go to: Final Exam

Geology (GLGY 461-UCAL) Midterm

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Standing on the shoulders of giants