Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Method of Evolution

Skip navigational links
Loading
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 21:48 - 23:23 (01:35)
Source: Annenberg/CPB Resources - Earth Revealed - 11. Evolution Through Time
Keywords: "Jamie Webb", fossil, "Rancho La Brea", Cenozoic, life, horse, evolution, ecosystem, woodland, grassland, environment, habitat, "Charles Darwin"

Our transcription: The fossils at Rancho La Brea represent a very brief span of late Cenozoic time, just 25 to 30,000 years.
Though few ancient life localities are as rich as Rancho La Brea, other Cenozoic fossils provide spectacular evidence of evolution spanning millions of years.
The case of the horse is especially stunning.
Appearing near the beginning of the Cenozoic the first horses were no larger than dogs and had four toes on each foot.
They lived in woodlands.
Then, about 40 million years ago a new ecosystem appeared on earth, the grasslands.
Moving in to forage this environment, the horse grew larger, and through time developed hooves to replace toes.
This permitted horses to run swiftly with better chance of survival in the open.
The idea that species gradually changed to better suit their natural habitats was first described by Charles Darwin some 150 years ago.
The main thing that Darwin contributed to our idea of life in the past and what happened was the method of evolution.
Prior to Darwin's idea of evolution, we knew that plants and animals changed.
We knew that they varied over time, but we didn't really have an idea as to why they changed, and Darwin gave us the method.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  


Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/10.01.24.html
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:26:22 PDT 2013  (chd)