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