[SunkenCiv]

A 1,100-year-old crater created by a meteorite the size of a big tree trunk has been discovered underneath thick growth (top) in western Canada, a November 2008 study said. Scientists used a new crater-spotting imaging technique to "strip" away the vegetation and reveal the 120-foot (36-meter) wide circular impression (bottom). [Photograph courtesy University of Alberta]

[SunkenCiv]

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[ClearCase_guy]

the size of a big tree stump

I like quantifiable science!

[SunkenCiv]

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[ozzymandus]

Is that what killed the dinosaurs? (JOKE!)

[blam]

This occurred 1,100 years ago and humans must have seen it.

How do you think a description of this thing was passed down in legend and myth?

Could it be a Thunderbird?

[Gondring]

Anatomy of a young impact event in central Alberta, Canada: Prospects for the missing Holocene impact record

Abstract:

Small impact events recorded on the surface of Earth are significantly underrepresented based on expected magnitude-frequency relations. We report the discovery of a 36-m-diameter late Holocene impact crater located in a forested area near the town of Whitecourt, Alberta, Canada. Although undetectable using visible imagery, the presence of the crater is revealed using a bare-Earth digital elevation model obtained through airborne light detection and ranging (LiDAR). The target material comprises deglacial Quaternary sediments, with impact ejecta burying a late Holocene soil dated to ca. 1100 ¹⁴C yr B.P. Most of the 74 iron meteorites (0.1–1196 g) recovered have an angular exterior morphology. These meteorites were buried at depths <25 cm and are interpreted to result from fragmentation of the original projectile mass, either at low altitude or during the impact event. Impact of the main mass formed the simple bowl-shaped impact structure associated with an ejecta blanket and crater fill. The increasing availability of LiDAR data for many terrestrial surfaces will serve as a useful tool in the discovery of additional small impact features.

Herd C, Froese D, Walton E, Kofman R, Herd E, et al. (2008) Anatomy of a young impact event in central Alberta, Canada: Prospects for the missing Holocene impact record. Geology: Vol. 36, No. 12 pp. 955–958

I ♥ LIDAR!

[free_life]

Nice find

[Reeses]

Scientists used a new crater-spotting imaging technique to "strip" away the vegetation and reveal the 120-foot (36-meter) wide circular impression (bottom).

It's something they've been working on their whole life.

[RJL]

In the upper right hand corner of the picture there is a smaller yet very similar round depression.