Type
Crossword
Description

This supercontinent that existed during the Mesozoic and Paleozoic Eras (200 to 250 million years ago). Pangaea
The movie "Jurassic Park" got its title from which era? Mesozoic
In which time period are we currently living? Cenozoic
A branch of geology dealing with the arrangement of sedimentary rocks Stratigraphy
The gradual movement of the continents across the earth's surface through geological time. Continental Drift
Determines the “relative” order of past events but not the absolute age Relative age
Specialized fossils that indicate the boundaries in geologic time and determine the age of rocks. Index fossils
Preserved remains of plants and animals from the remote past. Fossils
The end of life for a group of organisms, usually a species. Extinct
The block of geologic time that spans the largest percentage of Earth's history. Precambrian
An event that could have contributed to the late Paleozoic Extinction. climate change
The break-up of Pangaea is indirectly responsible for some of the igneous activity and ______in western North America. Mountain building
In the Precambrian period, rocks were buried and changed by _____________ and pressure. Fossils could not withstand the conditions. Extreme heat
A blue green algae thought to be one of the earliest forms of life on Earth. Cyanobacteria
A the division of Earth’s history based on life forms which lived during that period. Geologic timescale
An era known as the age of mammals Cenozoic
A period known as the age of Fishes. Devonian
The end of this era marks the largest mass extinction, which wiped out 95% of marine life and 70% of life on land. Paleozoic

Earth History Crossword

Type
Crossword
Description

relating or denoting to the most recent era Cenozoic
Era comprising of the Triassic, Jurassic, and Cretaceous periods Mesozoic
Largest extinction in Earth's history Permian
Prehistoric period during which stone was widely used StoneAge
Period in Earth's history Eon
A major division of geologic time era
The process of change that produces new life forms over time evolution
All the geologic time before the start of the Cambrian Period in the Paleozoic Era. Precambrian
period characterized by the greatest development, rise of modern insects and flowering plants cretaceous
many sea reptiles;early large dinosaurs; later,flying reptiles, and earliest known birds jurassic
Diverse marine life, including vertebrates; vascular plants Ordovician
Numerous fishes, other sea life; many plants, first trees; wingless insects Devonian
Formation of oceans, atmosphere, and continents; bacteria Archaean
Oldest era; organisms developed hard parts Paleozoic
oldest and longest geologic time period precambrian
subdivisions of eras periods
an extinct terrestrial reptile of the Mesozoic era dinosaur
a cold-blooded vertebrate including snakes and lizards reptile
science of the history of the earth as recorded in rocks geology
record of earths history geologic time scale

Geologic Time Scale Word Search

Type
Word Search
Description

Cenozoic Era
Eon
Era
Evolution
Geologic Time Scale
Mass Extinction
Mesozoic Era
Paleozoic Era
Period
Precambrian Time
Uniformitarianism

Geologic Time and Earth's History Crossword

Type
Crossword
Description

A time when many species such as humans came to be. CenozoicEra
A global extinction that causes at least 80% of a species to die. K-T Extinction
A tool used to relate geological events to time. Geologists often use this. Geologic Time Scale
The earliest period of Earth's history. Precambrian Time
The largest section of geological time. Eon
The era when dinosaurs were alive. Mesozoic Era
A span of time defined by large events. Era
One of the subdivisions on the geological time scale. Also a punctuation mark. Period
The second smallest division in geologic time. Epoch
The extinction of dinosaurs happened within this era. Paleozoic Era
Measurement of age in exact years. Absolute age
The isotope that undergoes radioactive decay in a nuclear reaction. Parent Isotope
Unchanged fossil remains from extinct or dead animals. Original Remains
A buried surface seperating two rock masses of different ages. Uncomformity
The product atom formed during radioactive decay in a nuclear reaction. Daughter Atom
A technique used to date materials such as rocks or carbon. Radioactive dating
States that the oldest rocks will be at the bottom and will have formed first. Law of Superposition
Rings on a tree trunk representing a single year's growth with each line. tree rings
The remains or impression of a prehistoric organism. Fossil
The age of something in relation to something else. Relative Age
A fossil that is used for dating and correlating the strata in which it is found. Index fossil
A fossil of a footprint rather than the animal itself. trace fossil
A core sample typically removed from an ice sheet. Ice Cores
A fossil found in rock that was created long after the animal of it died. Rock Fossil
the time taken for a radioactive isotope to fall to half of its original value. Half-life

Geologic Time Crossword

Type
Crossword
Description

The Hadean, Archean, and Proterozoic eons together. Makes up 90% of the Earth's history. Precambrian Time
Divides Earth's history into intervals of time defined by major events or changes on Earht. Geological Time Scale
Began 540 million years ago as the supercontinent Pannotia was breaking up. Paleozoic Era
The new supercontinent that was forming during the Paleozoic Era. Pangea
Began 250 million years ago after a mass extinction. Mesozoic Era
Creatures that dominated the world during the Mesozoic Era. DInosaurs
Began about 65 million years ago and continues to the present. Cenozoic Era
The Paleozoic, Mesozoic, and Cenozoic eras combined. Phanerozoic Eon
A major division of geological time, subdivided into eras. Eon
A major division of time that is a subdivision of an eon and is itself subdivided into periods. Era

geologic time crossword puzzle

Type
Crossword
Description

The ______ period contained the early humans on planet earth. neogene
this era contained Cave lions, sabre-toothed cats, and cave bears. cenozoic
The ______ period was the beginning of the Cenozoic era. paleogene
the _____ period happened 444 million years ago. silurian
this era contained dragonflies, reptiles, and lizards. paleozoic
this period is when Pangea Is Born. carboniferous
______ PERIOD HAPPENED 1.6 MILLION YEARS AGO quaternary
the ____ period was the period were mammals roamed earth. triassic
this period is when The first tetrapods formed on earth (known as land animals) devonian
this period contained Small Shelly fauna and Early Cambrian trilobites and echinoderms. cambrian
the ______ period had different dinos like the Triceratops and other different animals. creatacious
the_____ period contained different type of ocean and land animals like amphibians and fish. permian
the _____ period contained Lampreys and hagfish and other type of fish. ordovician
the _____ period contained more lushest type of plant growth and contained dinos like the Brontosaurus, and Allosaurus. jurassic
This era happened over 180 million years ago. mesozoic

Geologic Time and Fossils Crossword

Type
Crossword
Description

A record of geologic events and life forms in Earth's history Geologic Time
Name for the period of time in Earth's history thats 90% of Earth's time; cellular organisms lived Precambrian
Ancient Life includes cambrian explosions Paleozoic
middle Life age of reptiles Mesozoic
Recent life age of mammals Cenozoic
The age of a rock compared to rock layers Relative age
The numerical age of an object or event, as established by an absolute-dating process, such as radiometric dating Absolute Age
The preserved remains or traces of an organism that lived in the past Fossil
the process by which organic material is turned into stone Petrification
spaces in rocks previously occupied by bones or shells Molds
when fossils fill with sediments/minerals and hardens to take it's shape Cast
a fossil of a footprints, trails, burrow, or other traces of animals Trace fossil
The geologic principle that each layer is older then the one above Law of Superposition
A break in geologic record created when rock layers eroded Unconformity
Fossils of widely distributed organisms that only lived for a short period of time Index Fossil
the gradual change in a species over time Evolution

Geologic Time Scale Word Search

Type
Word Search
Description

Pangaea
Mammals
Reptiles
Humans
Dinosaurs
Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Silurian
Ordovician
Cambrian
Devonian
Cenozoic
Mesozoic
Paleozoic
Precambrian
Period
Era
Eon
Fossils
Extinction
Geologic Column
Geologic Time Scale

Earth History #1 Crossword

Type
Crossword
Description

earliest era of earth history, ending 570 million years ago Precambrian
a core sample that is typically removed from an ice sheet ice core
between the end of the Precambrian eon and the beginning of the Ordovician period. Cambrian
the state or process of a species, family, or larger group being or becoming extinct. "the extinction of the great auk" extinction
a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers Law of superposition
a system of chronological dating that relates geological strata to time Geological time scale
any method of determining the age of earth materials or objects of organic origin based on measurement of short-lived radioactive elements radioactive dating
a fossil that is useful for dating and correlating the strata in which it is found Index fossil
process of determining an age on a specified chronology in archaeology and geology Absolute dating
the remains or impression of a prehistoric organism preserved in petrified form fossil
the science of determining the relative order of past events relative dating
the outermost layer of a planet crust

Geologic Time/Fossils Word Search

Type
Word Search
Description

Evolution
Index Fossil
Unconformity
Law of Superposition
Trace Fossil
Cast
Molds
Petrification
Fossil
Absolute Age
Relative Age
Cenozoic
Mesozoic
Paleozoic
Precambrian
Geologic Time

Geotimeline Crossword

Type
Crossword
Description

explosion of life to present Phanerozoic Eon
eon before Phanerozoic eon Pre-Cambrian Eon
the era we are in now Cenozoic Era
dinosaur era Mesozoic Era
explosion of life Paleozoic Era
first period of Paleozoic Era and animals started appearing in the ocean Cambrian Period
first land plants started appearing Ordovician Period
animals like spiders started to move onto land Silurian Period
the age of the fishes Devonian Period
plant and animals on land were at huge sizes not seen today Carboniferous Period
last period of the Paleozoic Era Permian Period
first period of the Mesozoic Era and dinosaurs were now around Triassic Period
Pangea was starting to break apart Jurassic Period
last period of the Mesozoic Era and dinosaurs became extinct at the end of this period Cretaceous Period
it is the first period of the Cenozoic Era and mammals are starting to be in control Paleogene Period
the Megalodon shark came around and later died during this period Neogene Period
it is the last period of the Cenozoic Era and it is the period we are currently in Quaternary Period
the largest division of geologic time, comprising two or more eras Eon
a system of chronologic notation reckoned from a given date and it is smaller than an eon Era
a space of time between two events or a portion of time and it is smaller than an Era Period