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    Earth Science worksheet
    Topic: Geologic Time Units And The Events

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    Geologic Time Units And The Events
    1

    The diagram below is a portion of a geologic timeline. Letters A through D represent the time intervals between the labeled events, as estimated by scientists.

    geologic-history, reference-tables, earth-history, earth-history, geologic-time-units-and-the-events, standard-6-interconnectedness, magnitude-and-scale fig: esci12012-examw_g25.png

    Fossil evidence indicates that the earliest birds developed during which time interval?

    (1) A

    (2) B

    (3) C

    (4) D

    2

    The diagram below represents some fauna (animals) found fossilized in Canada’s Burgess shale.

    earth-history, earth-history, geologic-time-units-and-the-events, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci12014-examw_g6.png

    During which geologic epoch did these animals live?

    (1) Middle Cambrian

    (2) Early Pennsylvanian

    (3) Late Triassic

    (4) Paleocene

    3

    Which group of organisms survived mass extinctions that marked the ends of both the Paleozoic Era and the Mesozoic Era?

    (1) ammonoids

    (2) graptolites

    (3) eurypterids

    (4) gastropods

    Base your answers to questions 4 on the passage, data table, and diagrams below and on your knowledge of Earth science. The age ranges shaded on the data table show the geologic periods and epochs when six different graptolite fossils existed on Earth. Diagrams of the six graptolites are shown.

    Graptolite Fossils

    Although graptolite fossils are found in bedrock from the Cambrian Period into the Pennsylvanian Period, their remains are most abundant in Ordovician and Silurian rock layers. During their existence on Earth, graptolites evolved quickly and spread widely due to ocean circulation. These tiny and fragile fossils are usually found in dark shales that formed in marine environments. They are rare in sandstones or other rocks that formed near shore.

    earth-history, earth-history, geologic-time-units-and-the-events, standard-1-math-and-science-inquery, geocentric-model-heliocentric-model, standard-6-interconnectedness, models fig: esci12019-examw_g30.png

    4

    Which graptolite from the data table would best serve as an Early Ordovician index fossil?

    (1) Climacograptus

    (2) Clonograptus

    (3) Didymograptus

    (4) Goniograptus

    5

    Geologic history is divided into eras, periods, and epochs based on the

    (1) type of rock deposited at different times throughout history

    (2) half-life of radioactive isotopes found in rocks

    (3) inferred movements of Earth’s landmasses

    (4) fossil evidence found in bedrock

    6

    During which period in geologic history did the uplifting of the Adirondack Mountains begin?

    (1) Quaternary

    (2) Cretaceous

    (3) Triassic

    (4) Cambrian

    7

    During which geologic epoch do scientists infer that the earliest grasses first appeared on Earth?

    (1) Holocene

    (2) Pleistocene

    (3) Oligocene

    (4) Eocene

    Base your answers to questions 8 on the passage below and on your knowledge of Earth science.

    Waimea Canyon

    Waimea Canyon is located on the west side of the island of Kauai, Hawaii. Waimea Canyon has been referred to as the “Grand Canyon of the Pacific.” But unlike the Grand Canyon, which was carved through horizontal layers of sedimentary rocks, Waimea Canyon was cut through basalt. The formation of this igneous rock began about 4 million years ago. Numerous lava flows followed as magma rose from deep within Earth. The canyon then was formed over time by erosional agents, causing deep, V-shaped valleys that exposed the basalt layers along the canyon walls.

    Over time, the composition of the basalt, where it was exposed at the surface, was changed due to oxidation (rusting) of iron-bearing minerals, such as pyroxene and olivine. The result is a canyon with red rocks and soils.

    8

    Identify the epoch during which the first basalt lava flows occurred on Kauai. [1]

    Epoch

    Allow 1 credit for Pliocene Epoch.

    Base your answers to questions 9 on the timeline in image provided and on your knowledge of Earth science. The timeline represents the last 600 million years of geologic time. Shaded area A represents the Neogene Period.
    9

    On the timeline in the image below, accurately shade in an area to represent the entire Permian Period. [1]

    geologic-history, reference-tables, earth-history, earth-history, geologic-time-units-and-the-events, standard-1-math-and-science-inquery, eccentricity-rate-gradient-standard-error, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun fig: esci-v202-ansbk_abkq6.png

    Allow 1 credit for a shaded bar that begins and ends within or is touching the clear rectangles shown below.

    • geologic-history, reference-tables, earth-history, earth-history, geologic-time-units-and-the-events, standard-1-math-and-science-inquery, eccentricity-rate-gradient-standard-error, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun fig: esci-v202-rg_g6.png

    •

    • Note: It is recommended that an overlay of the same scale as the student answer sheet be used

    • to ensure reliability in rating.

    Base your responses to questions 10 on the passage below.

    Frozen Mammoth

    A wooly mammoth was found in 1999 buried in the frozen soil of the Siberian tundra. Carbon-14 dating indicated that it had died about 20,000 years ago. Many fossils represent only the partial remains of organisms. However, a complete mammoth with bones, skin, hair, and internal organs intact represented a unique opportunity for scientists to investigate the lifestyle of this animal and the environment in which it lived.

    10

    Identify both the period and epoch of geologic time during which the wooly mammoth lived. [1]

    Period

    Epoch

    Allow 1 credit if both responses are correct: Quaternary Period and Pleistocene Epoch.

    Base your answers to questions 11 on the maps below. The southwest corner of the New York State map below is enlarged in maps I, II, and III. Arrows on maps I, II, and III show the location and direction of flow for part of the Allegheny River at different times during the Cenozoic Era. The present boundaries of New York State and Lake Erie are shown on each map. Point A on map III represents a location in New York State.

    geologic-history, reference-tables, earth-history, earth-history, geologic-time-units-and-the-events fig: esci12013-exam_g41.png

    geologic-history, reference-tables, earth-history, earth-history, geologic-time-units-and-the-events fig: esci12013-exam_g40.png

    11

    Map II shows the course of the Allegheny River during a specific part of a geologic time period. State the name of this geologic time period. [1]

    Period

    Allow 1 credit for Quaternary Period.

    Base your answers to questions 12 on the geologic timeline below and on your knowledge of Earth science. The geologic timeline, drawn to scale, represents Earth’s geologic history. The letters A through H on the timeline represent the times of occurrence for specific, labeled geologic events. The time of occurrence for letter A has been omitted.

    geologic-history, reference-tables, earth-history, evolution-of-life-forms-and-the-free-oxygen-in-the-atmosphere, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci12017-examw_g32.png

    12

    Identify the geologic eon during which event letter B occurred. [1]

    Allow 1 credit for Precambrian or Archean.

    Base your answers to questions 13 on the geologic cross section below and on your knowledge of Earth science. The cross section represents sedimentary rock units labeled A through D, a layer of volcanic ash deposits, and a basalt extrusion. An unconformity is present between rock units B and C. Line XY represents a fault. The rock layers have not been overturned.

    reference-tables, scheme-for-metamorphic-rock-identification, rocks-and-minerals, formation-classification-and-application-of-rocks, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci12019-examw_g50.png

    13

    Fossils of the first multicellular, soft-bodied marine organisms were found in rock unit D. Identify the eon that indicates the geologic age of this rock unit. [1]

    Eon

    Allow 1 credit for Precambrian Eon or Proterozoic Eon.

    • Note: Do not allow credit for “Late Proterozoic” or “Late Precambrian” because these are eras,

    • not eons.

    Base your answers to questions 14 on the diagram below and on your knowledge of Earth science. The diagram represents the formation of coal and other fossil fuels in the environment.

    geologic-history, reference-tables, earth-history, earth-history, geologic-time-units-and-the-events, standard-1-math-and-science-inquery, changing-length-of-a-shadow-based-on-the-motion-of-the-sun, standard-6-interconnectedness, models fig: esci12020-examw_g35.png

    14

    Identify the geologic time period in which the extensive coal-forming forests represented in diagram A were most abundant. [1]

    Period

    Allow 1 credit for Carboniferous or Pennsylvanian Period.

    • Note: Do not allow credit for “Early Pennsylvanian” or “Late Pennsylvanian” because these terms

    • denote epochs not periods.

    Base your answers to questions 15 on the passage below.

    Dinosaur Skull Offers Hints About Africa’s Past

    A fossil skull was found in Africa among many dinosaur bones from the Late Cretaceous Epoch. This skull came from a dinosaur named Rugops primus, or “first wrinkle face.” This meat eater, believed to have been about 30 feet long and to have lived 95 million years ago, belonged to a group of dinosaurs called abelisaurids.

    This fossil skull, unearthed in the Sahara Desert in 2000, provides new evidence that Africa split from other southern continents at a later time than previously thought. Before this discovery, abelisaurids from that period had been found only in South America, Madagascar, and India, but not in Africa. This new fossil, Rugops primus, found only in Africa, indicates that Africa was still connected to the other southern landmasses, at least by a land bridge, 100 million years ago.

    15

    During which geologic era is Rugops primus inferred to have lived? [1]

    Era

    Allow 1 credit for Mesozoic Era.