ASBOG FG Exam 2025/2026 Exam
Questions and Correct Answers | New
Update
A plunging anticline will show closure in an outcrop pattern. In which
direction does the anticline plunge with respect to the closure? - 🧠ANSWER
✔✔A plunging anticline is plunging in ht direction of closure.
What can be inferred from a borehole log indicating a repetition of beds? -
🧠ANSWER ✔✔A repetition of beds in cross section indicates fault
movement in which the hanging wall has moved up with respect to the foot
wall (reserve faulting).
,Are slickensides indicative of faulting? - 🧠ANSWER ✔✔The presence of
slickensides may indicate faulting but this feature also results from non-
fault related movement in clays, such as shrinking and swelling.
What type of geologic feature might you expect from a mapped outcrop
pattern that consists of a series of series of concentric circular shapes? -
🧠ANSWER ✔✔1. Horizontal beds mapped on a rounded hilltop. 2.
Horizontal beds mapped in an enclosed basin. 3. An intrusion with bands of
contact metamorphism of varying degrees.
Chert is found commonly in the Coast Ranges Province of California. What
is its depositional environment and how is it formed? - 🧠ANSWER ✔✔Chert
originates in shallow sea water. Some cherts result from the enrichment of
silica in the sea water from volcanic rocks. They also may form by the
accumulation of silicious skeletons of silica secreting organisms.
According to the Unified Soil Classification System, gravels have a grain
size greater than what diameter? - 🧠ANSWER ✔✔gravel: >No. 4 sieve or
4.76 mm
,When observing cross-bedded sandstones, how do you know where the
top of the beds are? - 🧠ANSWER ✔✔Unit is right side up when cross-
bedding is concave up.
What type of geologic units would constitute a "key bed"? - 🧠ANSWER
✔✔Key beds are layers that have been deposited simultaneously over
large areas. Volcanic ash, beds rich in fish scales, oysters or corals.
What type of fault might be represented by juxtaposition in map view of
noncontiguous sedimentary formations. - 🧠ANSWER ✔✔Sedimentary
formations that do not occur next to each other may be moved laterally by
strike slip faults.
Name and define the 4 various different types of unconformities? -
🧠ANSWER ✔✔Angular unconformity: strata below the unconformity are cut
off and overlain at an angle by the beds above.
Nonconformity: sedimentary deposits rest upon older igneous or
metamorphic rocks.
Disconformity: beds above and below unconformity are parallel, but
unconformity not parallel to bedding.
Paraconformity: unconformity is parallel to the strata above and below it.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, How can the "rules of V's" be used on a map with no topography? -
🧠ANSWER ✔✔In using the rule of V's to interpret direction of dip on a map
with no topography you must first look at the V's downstream, since V
downstream is always dip downstream. When interpreting V's upstream
you must observe the quality of the V. Shallow V's mean dip upstream and
ac the V's get deeper it passes from horizontal bedding to a dip
downstream less than the valley gradient.
Define foot wall and hanging wall - 🧠ANSWER ✔✔Foot wall - block that
underlies a non-vertical fault.
Hanging wall - block that overlies a non-vertical fault
What is a regressive sequence? - 🧠ANSWER ✔✔Regression is the
withdrawal of the sea from land. A regression is represented by limestone
overlain by shale overlain by sandstone.
What is the order of deposition of evaporites? - 🧠ANSWER ✔✔Order of
Deposition
calcium carbonate - calcite
calcium sulfate - gypsum or anhydrite
sodium chloride - halite
Questions and Correct Answers | New
Update
A plunging anticline will show closure in an outcrop pattern. In which
direction does the anticline plunge with respect to the closure? - 🧠ANSWER
✔✔A plunging anticline is plunging in ht direction of closure.
What can be inferred from a borehole log indicating a repetition of beds? -
🧠ANSWER ✔✔A repetition of beds in cross section indicates fault
movement in which the hanging wall has moved up with respect to the foot
wall (reserve faulting).
,Are slickensides indicative of faulting? - 🧠ANSWER ✔✔The presence of
slickensides may indicate faulting but this feature also results from non-
fault related movement in clays, such as shrinking and swelling.
What type of geologic feature might you expect from a mapped outcrop
pattern that consists of a series of series of concentric circular shapes? -
🧠ANSWER ✔✔1. Horizontal beds mapped on a rounded hilltop. 2.
Horizontal beds mapped in an enclosed basin. 3. An intrusion with bands of
contact metamorphism of varying degrees.
Chert is found commonly in the Coast Ranges Province of California. What
is its depositional environment and how is it formed? - 🧠ANSWER ✔✔Chert
originates in shallow sea water. Some cherts result from the enrichment of
silica in the sea water from volcanic rocks. They also may form by the
accumulation of silicious skeletons of silica secreting organisms.
According to the Unified Soil Classification System, gravels have a grain
size greater than what diameter? - 🧠ANSWER ✔✔gravel: >No. 4 sieve or
4.76 mm
,When observing cross-bedded sandstones, how do you know where the
top of the beds are? - 🧠ANSWER ✔✔Unit is right side up when cross-
bedding is concave up.
What type of geologic units would constitute a "key bed"? - 🧠ANSWER
✔✔Key beds are layers that have been deposited simultaneously over
large areas. Volcanic ash, beds rich in fish scales, oysters or corals.
What type of fault might be represented by juxtaposition in map view of
noncontiguous sedimentary formations. - 🧠ANSWER ✔✔Sedimentary
formations that do not occur next to each other may be moved laterally by
strike slip faults.
Name and define the 4 various different types of unconformities? -
🧠ANSWER ✔✔Angular unconformity: strata below the unconformity are cut
off and overlain at an angle by the beds above.
Nonconformity: sedimentary deposits rest upon older igneous or
metamorphic rocks.
Disconformity: beds above and below unconformity are parallel, but
unconformity not parallel to bedding.
Paraconformity: unconformity is parallel to the strata above and below it.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY 3
STATEMENT. ALL RIGHTS RESERVED
, How can the "rules of V's" be used on a map with no topography? -
🧠ANSWER ✔✔In using the rule of V's to interpret direction of dip on a map
with no topography you must first look at the V's downstream, since V
downstream is always dip downstream. When interpreting V's upstream
you must observe the quality of the V. Shallow V's mean dip upstream and
ac the V's get deeper it passes from horizontal bedding to a dip
downstream less than the valley gradient.
Define foot wall and hanging wall - 🧠ANSWER ✔✔Foot wall - block that
underlies a non-vertical fault.
Hanging wall - block that overlies a non-vertical fault
What is a regressive sequence? - 🧠ANSWER ✔✔Regression is the
withdrawal of the sea from land. A regression is represented by limestone
overlain by shale overlain by sandstone.
What is the order of deposition of evaporites? - 🧠ANSWER ✔✔Order of
Deposition
calcium carbonate - calcite
calcium sulfate - gypsum or anhydrite
sodium chloride - halite
