Logo IMG
HOME > My Amsci > Restricted Access

Restricted Access The content you've requested is available without charge only to active Sigma Xi members and American Scientist subscribers.

If you are an active member or an individual subscriber, please log in now in order to access this article.

If you are not a member or individual subscriber, you can:


Figure 2. Landing site of the Mars PathfinderClick to Enlarge Image

The Mars Pathfinder spacecraft landed in a giant Martian floodplain, at the confluence of two ancient river valleys—a site chosen for the supposed variety of rocks that would have been carried downstream by the catastrophic flood that sculpted the region billions of years ago. Aboard the spacecraft, two scientific instruments—an imager and a spectrometer—peered at and analyzed the Martian rocks and the soil with the aim of further defining the geologic history of the Red Planet. So far the results of the analyses are consistent with the hypothesis that many of the rocks have a volcanic origin, and that they have variously experienced a catastrophic flood and a period of meteoric bombardment.

Connect With Us:


Subscribe to Free eNewsletters!

Read Past Issues on JSTOR

JSTOR, the online academic archive, contains complete back issues of American Scientist from 1913 (known then as the Sigma Xi Quarterly) through 2005.

The table of contents for each issue is freely available to all users; those with institutional access can read each complete issue.

View the full collection here.

RSS Feed Subscription

Receive notification when new content is posted from the entire website, or choose from the customized feeds available.

Write for American Scientist

Review our submission guidelines.

Subscribe to American Scientist