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## Murphy's Haystacks

A cache by releasethedogs Message this owner
Hidden : 03/28/2011
Difficulty:
Terrain:

Size:  (other)

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## Geocache Description:

Murphys Haystacks consists of two separate though clearly related groups of large, pink (some call it red) Hiltaba granite pillars and boulders standing on Oakfront Hill, just to the west of the Streaky Bay - Port Kenny Road, some 30km northwest of Port Kenny in Australia.

Some 1500 million years ago, boiling magma filled crevices below the earth’s surface and then cooled, laying down a granite base. The present formations you see at Murphy’s haystacks were formed 100,000 years ago and were buried within the earth until a short time ago (geologically speaking). Then, 34,000 years ago the “haystacks” were uncovered by severe and uneven erosion which exposed them in their present state as pillars or boulders. The “haystacks” slowly continue to be eroded, giving them the uneven and distinctive shapes that you see today. As you notice they are colorfully adorned with lichen. The cost of entry is $2.00 for Adults or a whole Family for$5.00. Please pay at the honor box. The Haystacks can be visited daily from Dawn to Dusk.

Validating the EarthCache find:
1. Please explain the difference between the two types of rock formations (i.e pillars and boulders) other than the shape. Specifically, what geologically sets them apart.

2. Notice that the lower section of many of the “haystacks” are rough, corroded and pitted which is different from the smooth upper sections. Please interpret how and/or why they are rough toward the ground but smooth above.

3. Imagine that the soil around the “haystacks” was massively eroded. Based on what you know about how the “haystacks” formed and the information provided on the signs at the site predict what we might find below the earth’s surface.

4. Please post a photo of you with your GPS in front of the haystacks. (optional)

Send me the answers in an e-mail then post your find. If there is a problem, i will let you know.