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Go to: Midterm I | Final
Geology (GLGY 381-UCAL) Midterm Exam II
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Question 1 |
A | tidal energy based delta (bird's foot) |
B | wave energy based delta (cupcake) |
C | tidal energy based delta (smear) |
D | wave energy based delta (smear) |
Question 2 |
A | shallow lake facies will consist of alternating large scale muddy beds and sandy beds. |
B | None of the answers are correct. |
C | deep lake facies will consist of very finely laminated muds deposited from suspension alternating with thin graded turbidites. |
D | shallow lake facies will consist of very finely laminated muds deposited from suspension alternating with thin graded turbidites. |
E | deep lake facies will consist of alternating large scale muddy beds and sandy beds. |
Question 3 |
A | Layers bound by cyanobacteria found as clasts within carbonate sediments. |
B | Planktonic yellowgreen algae that are extremely important contributors to marine sediments. |
C | Very fine grained material that precipitate by the breakdown of skeletal fragments. |
D | Fragments of calcium carbonate material that has been partly lithified. |
E | Bodies of calcium carbonate less than 2mm in diameter and form by the precipitation of calcium carbonate. |
Question 4 |
2. silt and mud
3. ripples
4. lamination
5. fine lamination
A | 3 (bottom) --> 4 --> 1 --> 2 --> 5 (top) |
B | 1 (bottom) --> 4 --> 5 --> 3 --> 2 (top) |
C | 2 (bottom) --> 4 --> 3 --> 5 --> 1 (top) |
D | 1 (bottom) --> 4 --> 3 --> 5 --> 2 (top) |
Question 5 |
A | Calcium sulphate enrichment of groundwater. |
B | Increase the salinity of the groundwater. |
C | Decrease in the normal level of water table. |
D | Replacement of dolomite by anhydrites. |
E | Increase in the normal level of water table. |
Question 6 |
A | False |
B | True |
Question 7 |
A | It will not stain dolomite but colours the other carbonates pink. |
B | It will increase the relief by staining the dolomite grain boundaries. |
C | It will stain dolomite red but will not stain the other carbonates. |
D | It will react with dolomite and stain it in green. |
Question 8 |
A | The area must have been arid. |
B | This particular core section must have been taken from the distal edge of a weave dominated delta deposit. |
C | This particular core section represents a channel bar deposit. |
D | The area must have been enriched in organic matter. |
E | The area must have been concentrated with poorly developed soil. |
Question 9 |
A | sediment accumulation. |
B | helicoidal flow. |
C | gravitational flow. |
D | gravitational force. |
Question 10 |
A | Gypsum - Calcium carbonate - Sodium sulphates (eg. mirabilite) - Halite |
B | Gypsum - Sodium sulphates (eg. mirabilite) - Calcium carbonate - Halite |
C | Calcium carbonate - Gypsum - Sodium sulphates (eg. mirabilite) - Halite |
D | Calcium carbonate - Halite - Sodium sulphates (eg. mirabilite) - Gypsum |
E | Calcium carbonate - Sodium sulphates (eg. mirabilite) - Gypsum - Halite |
Question 11 |
A | Addition of chemicals from outside of the strata into the pore spaces reducing the porosity. |
B | Precipitation of minerals into the pore spaces reducing the porosity. |
C | Precipitation of minerals into the pore spaces increasing the porosity. |
D | Addition of chemicals from outside of the strata into the pore spaces increasing the porosity. |
Question 12 |
A | imbricated clasts can be observed om gravel braided system. |
B | ε cross beds form in the point bar side of a meandering river. |
C | anastomosing rivers are avulsion dominated rivers. |
D | braided rivers are part of alluvial systems. |
E | point bar is an area of high erosion. |
Question 13 |
A | right side in N. America and left side in Australia. |
B | left side in N. America and right side in Australia. |
C | downstream side. |
D | upstream side. |
E | left and right side, parallel to the flow. |
Question 14 |
A | near a meandering river. |
B | in a braided river. |
C | in the anastomosing river. |
D | in a high density flow dominated stream. |
E | near a braided river. |
Question 15 |
A | Facies only form in complex geologic environments. |
B | A rock or lithologic unit that has consistent properties is known as a facies. |
C | Bed are vertical planer features resulted from recent geologic activities. |
D | Beds are composed of several facies. |
Question 16 |
A | increase in elevation |
B | increase in sediment load Hint: this will decrease the accommodation space due to higher rate of sed accumulation. |
C | uplift |
D | subsidence |
Question 17 |
-active and extinct distributaries
-poorly sorted and mostly matrix supported
-reverse grading in basal section
-very steep surface with no vegetation
A possible environment for such observations could be....
A | high sediment load river bed |
B | low sediment load river bed |
C | stream flow dominated fan |
D | debris flow dominated fan |
E | humid-desert extreme weather dominated river bed |
Question 18 |
A | grains transported to a new environment. |
B | sediments get buried. |
C | original horizontally changed due to a tectonic event. |
D | soil created. |
Question 19 |
A | Lake margins with very gentle slopes. |
B | Areas of mixing salt water with fresh water. |
C | Within deep channels in a braided river system. |
D | At the mouth of rivers that carry large sediment load. |
E | At the toe of wave dominated deltas with large scale muddy deposits. |
Question 20 |
A | It is a type of quartz that lacks water. |
B | It is the dehydrated and fibrous version of sylvite. |
C | It is a type of precipitate occurs between grains of iron rich sediments. |
D | It is the dehydrated version of gypsum. |
E | It is the fibrous mineral version of halite. |
Question 21 |
A | Avulsion and migration both caused by the rapid change of a river channel. But avulsion is found in braided rivers and migration found in meandering rivers. |
B | Migration is the rapid change of a river channel and usually caused by a sudden event such as a flood or an earthquake. Avulsion is the normal lateral motion of an alluvial river channel across its floodplain. |
C | Avulsion and migration both caused by the rapid change of a river channel. But migration is found in braided rivers and avulsion found in meandering rivers. |
D | Avulsion is the rapid change of a river channel and usually caused by a sudden event such as a flood or an earthquake. Migration is the normal lateral motion of an alluvial river channel across its floodplain. |
Question 22 |
A | Chemical weathering |
B | Rise of water table |
C | Fall of water table |
D | Physical weathering |
E | Gravity and pressure due to overburden sediment load |
Question 23 |
A | estuarine , sheet flood |
B | ephemeral lake , estuarine |
C | delta , ephemeral lake |
D | sheet flood , aeolian dunes |
Question 24 |
A | Flat or straight distal edge. |
B | Large distributary channels developed well into the distal regions. |
C | Lobe shaped bay fill towards the sea with a shape like a "bird's foot". |
D | Increase in sediment accumulation towards the distal edge due to sandy deposits. |
Question 25 |
A | overbanks of lakes. |
B | underwater fluvial deposits. |
C | anastomosing rivers. |
D | meandering rivers. |
Question 26 |
A | Development of soil form vegetation. Hint: Yes, but typically for smaller oxbow lakes. |
B | Gravel deposits through biological activities in the surrounding area. |
C | During a flooding event. |
D | Collapse of sediments from overbanks. |
Question 27 |
A | beginning of the flow. |
B | middle of the flow. |
C | end of flow. |
Question 28 |
A | anastomosing |
B | meandering |
C | braided |
D | graded |
Question 29 |
A | tidal flow delta with a shape of a cupcake. |
B | sediment impact delta with a shape of a bird's foot. |
C | wave influx delta with a shape of a cupcake. |
D | wave influx delta with a shape of a bird's foot. |
Question 30 |
A | fluvial dominated. |
B | tidal dominated. |
C | wave dominated. |
D | alluvial dominated. |
Question 31 |
A | shallow unstable channels. |
B | high gradient. |
C | rivers with high width to depth ratio. |
D | low gradient. |
E | stable channels carrying a lose sediment load (such as sand/mud). |
While the meander is caused by several factors; the main factor is the low slope of the channel.
Question 32 |
A | Epsomite |
B | Glass |
C | Halite |
D | Apatite |
E | Quartz |
Question 33 |
A | rise in global base level. |
B | rise in local base level. |
C | fall in global base level. |
D | fall in local base level. |
Question 34 |
A | regression |
B | erosion |
C | base level increase |
D | subsidence |
E | transgression |
Question 35 |
(A) Channels --> Levees --> Crevasse splay --> Floodplain (B)
A | the density increases. |
B | the bioturbation decreases. |
C | the density decreases. |
D | the grain size decreases. |
E | the grain size increases. |
Question 36 |
A | tidal energy delta system. |
B | wave energy delta system. |
C | sandy braided system. |
D | gravel braided system. |
Question 37 |
A | Distributaries |
B | Overbanks |
C | Extinct channels. |
D | Tributaries |
E | Avulsion |
Question 38 |
A | density of effluent = density of the ambient |
B | density of effluent > density of the ambient Hint: aka hyperpycnal flow |
C | density of effluent/density of the ambient = infinity |
D | density of effluent < density of the ambient |
Question 39 |
A | None of the answers are correct because it could either increase or decrease depending on the environment. |
B | fluctuate between high and low |
C | remain consent |
D | decrease |
E | increase |
Question 40 |
A | Planktonic yellowgreen algae that are extremely important contributors to marine sediments. |
B | Fragments of calcium carbonate material that has been partly lithified. |
C | Very fine grained material that precipitate by the breakdown of skeletal fragments. |
D | Bodies of calcium carbonate less than 2mm in diameter and form by the precipitation of calcium carbonate. |
E | Layers bound by cyanobacteria found as clasts within carbonate sediments. |
Question 41 |
A | False |
B | True |
Question 42 |
A | observe a drop in base level moving downstream (negative change in slope). |
B | observe a no change in base level or overall elevation since the sediments get deposited in a rapid rate. |
C | observe a increase in base level moving downstream (positive change in slope). |
D | observe an increase and then a decrease in base level moving downstream (like a bra cup). |
Question 43 |
A | Floodplains |
B | Levees |
C | Crevasse Splays |
D | Channels |
Question 44 |
A | Flow expansion is caused by decrease in sediment load of the fluid flow. |
B | Flow expansion is caused by decrease in area of the fluid flow. |
C | Flow expansion is caused by increase in area of the fluid flow. |
D | Flow expansion is caused by increase in sediment load of the fluid flow. |
Question 45 |
A | low energy conditions. |
B | low density flows. |
C | high density flows. |
D | high energy conditions. |
Question 46 |
A | Subaerial debris flows |
B | Sheetflood deposition |
C | Channel banks |
D | Stream-channel fans |
Question 47 |
A | A. longitudinal bars B. transverse bars |
B | A. transverse bars B. longitudinal bars |
C | A. unstable channels B. stable channels |
D | A. stable channels B. unstable channels |
E | A. levees B. point bars. |
Question 48 |
A | Calcite is calcium carbonate, CaCO3 while aragonite is iron carbonate, FeCO3. |
B | Calcite is a carbonate mineral while aragonite is a silicate mineral. |
C | Calcite is calcium carbonate, CaCO3 while aragonite is calcium magnesium carbonate, CaMg(CO3)2. |
D | Calcite has a different chemical properties than aragonite because calcite has an extra calcium ion. |
E | Calcite has a trigonal crystal form, aragonite has an orthorhombic crystal form. |
Question 49 |
-Several channels filled with sandy to muddy deposits
-Most of the channel fills overlaps each others
-Both vertically and laterally the channels are closer to each other
A | River avulsion must have occurred with a much lower rate of channel fill and higher subsidence rate relative to the rate of overbank fill. |
B | River avulsion must have occurred with a much higher rate of channel fill and slow subsidence rate relative to the rate of overbank fill. |
C | Several rivers must have been cut across the paleo flood plane at the same period of time, resulting multiple channels. |
D | Must have been a submarine deposit channels within a large underwater deltaic environment. |
E | Sediment load must have been enriched in sand relative to muddy and other materials. |
Question 50 |
A | Scars and oxbow lakes are produced by meandering rivers. The difference is where oxbow lakes are filled with water. |
B | They are the same thing, scars formed in dry-humid environment and oxbow lakes formed in wet environments. |
C | Scars are produced by anastomating rivers and oxbow lakes are produced by meandering rivers. |
D | Scars are produced by braided rivers and oxbow lakes are produced by meandering rivers. |
Question 51 |
A | muddy rivers enter the lake |
B | this question is stupid |
C | areas with high friction |
D | rivers with low sediment load |
Question 52 |
A | fluvial dominated. |
B | wave dominated. |
C | tidal dominated. |
D | alluvial dominated. |
Question 53 |
A | Between meandering section and the upstream of rivers with high sediment load. |
B | Between meandering section and the upstream of rivers with low sediment load. |
C | At low gradient slopes near the mouth of the river with low sediment load. |
D | At low gradient slopes near the mouth of the river with high sediment load. |
Question 54 |
A | Typically sands are moderately well sorted. |
B | Facies an be best described as commonly occur with fluvial deposits, evaporites and associated with aeolian facies. |
C | Dominated by sandstone, mudstone, fine-grained
limestones and evaporites lithologies. |
D | Often wave ripples and very fine parallel lamination are observed. |
E | Very high degree of palaeocurrents preservation with extensive paleocurrent networks. |
Question 55 |
A | True |
B | False, that's a point bar. |
C | False, that's a longitudinal bar. |
Question 56 |
A | Potassium |
B | Magnesium |
C | Sodium |
D | Chlorine |
E | Calcium |
Question 57 |
A | the loss of energy(velocity) of the load bearing currents. |
B | the gain of energy(velocity) of the load bearing currents. |
C | the change in base level. |
D | the change in elevation. |
Question 58 |
A | Chemical and nuclear |
B | Chemical and mechanical |
C | Chemical and biological |
D | Physical and chemical |
E | Physical, chemical and biological |
Question 59 |
A | A. steeper slopes in a small area B. shallower slopes in a wide area |
B | A. steeper slopes in a small area B. shallower slopes in a small area |
C | A. shallower slopes in a small area B. steeper slopes in a wide area |
D | A. shallower slopes in a small area B. steeper slopes in a small area |
E | A. steeper slopes in a wide area B. shallower slopes in a small area |
Question 60 |
A | alluvial fan |
B | braided river |
C | tidal dominated delta |
D | meandering river |
E | fluvial dominated delta |
F | wave dominated delta |
Question 61 |
A | Liquified Flow |
B | Debris Flow |
C | Density Flow |
D | Sediment Gravity Flow |
Question 62 |
A | Matrix supported with more than 10% grains. |
B | Mud supported with less than 10% grains. |
C | Grain supported with some mud within the matrix. |
D | Organic framework supported with original components organically bounded. |
E | Mud supported with more than 10% grains. |
Question 63 |
A | True |
B | False |
Question 64 |
A | Typically thin iron rich beds are composed of haematite rich
sediments. |
B | BIFs forms in modern environment, but at much smaller scale and rate. |
C | Iron within BIFs must have been oxidized before they were deposited as bands of thin beds. |
D | BIFs most likely formed in deep basins with very high iron rich organic sediment influx. |
Question 65 |
A | on a river bed |
B | an alluvial fan |
C | an oxbow lake |
D | on a large vegetated point bar |
Question 66 |
A | It is the term given to local base level of a fluvial system. |
B | It is the term given to local sea level. |
C | It is the term given to absolute sea level. |
D | It is a drug that most geologists take to get high in the woods. |
Question 67 |
A | Younger/modern point bar |
B | Older point bar |
C | Older alluvial fan |
D | Older oxbow lake |
E | Younger/modern river bed |
Question 68 |
A | Stromatolites |
B | Stromatoporoids |
C | Ahermatypic serpulids |
D | Oncoids |
E | Thrombolites |
Question 69 |
A | It can varies widely between 10 of cms to 1000s of Kms depend on the environment. |
B | 10 of cms |
C | 100s of ms |
D | 1000s of Kms |
E | 100s of Kms |
Question 70 |
A | True |
B | False |
Question 71 |
A | False |
B | True |
Question 72 |
A | I. wave dominated II. estuary |
B | I. tidal dominated II. flood plains |
C | I. tidal dominated II. flood plains |
D | I. tidal dominated II. estuary |
Question 73 |
A | laterally left or right |
B | vertically and laterally |
C | vertically downwards |
D | vertically upwards |
Question 74 |
A | Delta formed due to hyperpycnal flow |
B | Alluvial fan formed by a stream with high density sediment load |
C | Delta formed due to hyperpycnal flow |
D | Alluvial fan formed by a stream with heavy sediment load |
E | Delta formed due to tidal flow |
Question 75 |
A | rise in sea level cause regression. |
B | only beds with above 6 cm in thickness can be consider as a facies. |
C | high energy currents can flow upstream, if the total energy of the current is higher than the gravitational gradient. |
D | the vertical succession of facies reflects lateral changes in environment. |
Question 76 |
A | Dominichnia |
B | Fodinichina |
C | Passichnia |
D | Repichinia |
E | Cubichina |
Question 77 |
A | Complete dolomitisation. |
B | Saturated zones of calcite within the matrix. |
C | Presence of globular masses of digenetic minerals within matrix. |
D | Isopachous cement between grains. |
E | Meniscus cements between grains. |
Question 78 |
A | True if the core samples are taken within few lateral meters from each other. |
B | False |
C | True if the core penetrated across different strata. |
D | True if the core is taken perpendicular to the natural depositional surfaces. |
Question 79 |
A | Oncoids |
B | Peloids |
C | Ooids |
D | Pisoids |
Question 80 |
A | Seaward movement of the shore line often as a direct result of drop in sea level. |
B | Seaward movement of the shore line often as a direct result of rise in sea level. |
C | Landward movement of the shore line often as a direct result of rise in sea level. |
D | Landward movement of the shore line often as a direct result of fall in sea level. |
Question 81 |
A | A. observations B. analysis |
B | A. analysis B. observations |
C | A. interpretations B. observations |
D | A. alcohol B. dirty girls |
E | A. observations B. interpretations |
Question 82 |
A | Shallowest part of the river. |
B | Floodplains on both sides of the river. |
C | Near the outer cut bank. Hint: aka outer bank |
D | Near the point bar. |
Question 83 |
A | Section E; the fifth one from the bottom. |
B | Section A; the first one from the bottom. |
C | Section D; the fourth one from the bottom. |
D | Section C; the third one from the bottom. |
E | Section B; the second one from the bottom. |
Question 84 |
A | Lakes with very high heat capacity hence able to reduce the temperate of the surrounding regions. |
B | Lakes that are temporary bodies of water that exist for short periods of time. |
C | Lake that are hydrologically closed and produce large deposits of precipitate minerals. |
D | Lakes that form in a volcanic crater or caldera. |
Question 85 |
A | Close to an extinct channel. |
B | In the most expanded area. |
C | Close to the canyon. |
D | Close to the lowest base level. |
Question 86 |
A | Organic precipitate of calcium carbonate. |
B | Deep lake facies characterized by high concentrations of oncoids. |
C | Clastic lake margin deposits. |
D | Inorganic precipitate of calcium carbonate. |
E | A type of sediment that was undergoing transition to coal from peat. |
Question 87 |
A | Epilimnion waters |
B | Oxic environment |
C | Sediment load dominated by fine grains |
D | Hypolimnion waters |
E | Thermocline waters |
Question 88 |
A | oscillatory flows |
B | diagenesis flow |
C | sediment-gravity flows |
D | density flows |
Question 89 |
A | A. fluvial B. coarser |
B | A. alluvial B. coarser |
C | A. fluvial B. finer |
D | A. alluvial B. finer |
Question 90 |
A | debris flow dominated fans |
B | gradual erosional environments such as a beach/river bed. |
C | poorly-sorted load dominated currents |
D | stream-flow dominated fans |
E | all alluvial fans |
Question 91 |
A | 1 km to tens of kilometers. |
B | Less than 20 meters. |
C | One to ten kilometers. |
D | Hundreds of thousands of kilometers. |
E | 100s of meters to a few kilometers. |
Question 92 |
A | pyrite and calcite |
B | silica and iron |
C | calcite and silica |
D | silica and pyrite |
Question 93 |
A | precipitation of minerals into the pore spaces reducing the porosity. |
B | increase in volume as a direct result of increase in pressure due to burial. |
C | reduce porosity causing beds to be thinner and dehydrated. |
D | creates facies due to increase in temperature and pressure. |
Question 94 |
A | Wackestone |
B | Boundstone |
C | Grainstone |
D | Rudstone |
E | Carbonate mudstone |
Question 95 |
A | Epsomite |
B | Apatite |
C | Selenite |
D | Sylvite |
E | Gypsum |
Question 96 |
A | False |
B | True |
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Credits: Based on the excellent class notes provided by, Dr. Melissa Giovanni during Fall 2012. This version has been updated on between January and February 2016.
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My personal advice: Since the exams are written, if you score less than 90% on the following MC questions, seriously reconsider your study strategies for this class.