geologic time

noun

Definition of geologic time

: the long period of time occupied by the earth's geologic history
geologic time table

Examples of geologic time in a Sentence

Recent Examples on the Web Scientists say the periodic exposure to the elements of big chunks of volcanic rock as a result of tectonic movement has, over a geologic time scale, influenced the Earth’s climate, even helping bring on ice ages. Peter Fimrite, SFChronicle.com, "Could putting pebbles on beaches help solve climate change?," 16 Dec. 2019 Her Hugo Award-winning Broken Earth books feature a supercontinent called the Stillness that is anything but—the very land is a geologic time bomb, ravaged by earthquakes and volcanic eruptions. Wired, "For N. K. Jemisin, World-Building Is a Lesson in Oppression," 12 Nov. 2019 In geologic time, the volcano under Yellowstone National Park will erupt again. Edward Lotterman, Twin Cities, "Real World Economics: Lessons seen in ill-fated water-rail plan," 9 Nov. 2019 The ocean’s pH has shifted on geologic time scales. Alejandra Borunda, National Geographic, "Ocean acidification, explained," 7 Aug. 2019 Fossils span geologic time from hundreds to even billions of years and are discovered in many rock types and settings. Erin Dimaggio, Smithsonian, "How Do Scientists Date Fossils?," 13 June 2019 These new divisions of geologic time will likely bring some order and clarity to an era defined by monumental change, but not all scientists agree that the new ages are the best way to reclassify recent history. Avery Thompson, Popular Mechanics, "According to Geologists, We're Living In a New Age," 18 July 2018 At its core lay the realization battered into him on his first journey down the Colorado about humanity’s impermanence in the face of geologic time and how the Earth remained in a continual state of flux. Johnforristerross, Longreads, "Taming the Great American Desert," 2 July 2018 Over geologic time, Earth’s CO2 is regulated by the balance between volcanic outgassing, which adds CO2 to the atmosphere, and CO2 removal by chemical weathering of rocks. Scott Denning, Washington Post, "May the 4th be with Earth, a perfect planet that’s not too Hoth or Tatooine," 4 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'geologic time.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of geologic time

1861, in the meaning defined above

Keep scrolling for more

Learn More about geologic time

Time Traveler for geologic time

Time Traveler

The first known use of geologic time was in 1861

See more words from the same year

Statistics for geologic time

Last Updated

28 Dec 2019

Cite this Entry

“Geologic time.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/geologic%20time. Accessed 25 Feb. 2020.

More from Merriam-Webster on geologic time

Rhyming Dictionary: Words that rhyme with geologic time

Britannica.com: Encyclopedia article about geologic time

Comments on geologic time

What made you want to look up geologic time? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!