Yellowstone and the Great West: Journals, Letters, and Images from the 1871 Hayden Expedition

By Marlene Deahl Merrill | Go to book overview
Save to active project

Glossary of Geological Terms and Fossil Shells
Several sources were consulted in order to define the geological terms found in the Allen and Peale journals in a readily accessible manner: The American Heritage Dictionary ( Boston, 1976, 1985, 1992); The Concise Oxford Dictionary of Earth Sciences, edited by Ailsa Allaby and Michael Allaby( Oxford: Oxford University Press, 1991); and The Dictionary of Geological Terms, edited by Robert L. Bates and Julia A. Jackson ( New York: Doubleday, 1984). The geologic table is adapted from the Bates and Jackson dictionary.GEOLOGICAL TERMS
agate: a fine-grained, fibrous variety of chalcedony with colored bands or irregular clouding.
alluvium: sediment deposited by flowing water, as in a riverbed, floodplain, or delta.
anticline: a fold, generally convex and upward, whose core contains stratigraphically older rocks.
amygdaloidal spaces: spheroidal, ellipsoidal, or almond-shaped cavities in a lava flow.
auriferous: containing gold.
basalt: a hard, dense, dark volcanic rock, often having a glossy appearance.
breccia: literally, "rubble"; a rock composed of sharp-angled fragments cemented in a fine matrix.
calcareous: composed of calcium carbonate, calcite, or limestone; chalky.
chalcedony: a translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.
chlorite: a generally green or black secondary mineral often formed by metamorphic alteration of primary dark minerals.
conglomerate: a rock consisting of pebbles and gravel, generally embedded in a sandy matrix; one variety is called "pudding stone."

-283-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
Loading One moment ...
Project items
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

Cited page

Bookmark this page
Yellowstone and the Great West: Journals, Letters, and Images from the 1871 Hayden Expedition
Settings

Settings

Typeface
Text size Smaller Larger
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

While we understand printed pages are helpful to our users, this limitation is necessary to help protect our publishers' copyrighted material and prevent its unlawful distribution. We are sorry for any inconvenience.
Full screen
/ 322

matching results for page

Cited passage

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

Cited passage

Welcome to the new Questia Reader

The Questia Reader has been updated to provide you with an even better online reading experience.  It is now 100% Responsive, which means you can read our books and articles on any sized device you wish.  All of your favorite tools like notes, highlights, and citations are still here, but the way you select text has been updated to be easier to use, especially on touchscreen devices.  Here's how:

1. Click or tap the first word you want to select.
2. Click or tap the last word you want to select.

OK, got it!

Thanks for trying Questia!

Please continue trying out our research tools, but please note, full functionality is available only to our active members.

Your work will be lost once you leave this Web page.

For full access in an ad-free environment, sign up now for a FREE, 1-day trial.

Already a member? Log in now.

Are you sure you want to delete this highlight?