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Yellowstone's Liberty Cap

A cache by Team FMA Send Message to Owner Message this owner
Hidden : 9/12/2010
2 out of 5
1.5 out of 5

Size: Size: other (other)

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Geocache Description:

Hats off to one of Yellowstone's more unusual yet very memorable geological features!

Please do not log this EC as found without emailing your responses to us within 24 hours. On-site observation is necessary to complete this EC, so be ready to observe!.

Visitors to Yellowstone National Park's Mammoth Hot Springs typically ooh and ahh as they stroll the trails leading through and around the geothermal terraces for which this area is named. Tiered like wedding cakes with fluted edges sculpted by nature, the travertine terraces of Mammoth Hot Springs are a breathtaking example of the park's geothermal activity.

So what is this tall, oddly shaped object near the Lower Terraces that sticks out like a sore thumb?

This natural structure is known as the Liberty Cap. Named in 1871 by the Hayden Survey Party, Liberty Cap was so dubbed because of its resemblance to the peaked hats worn during the French Revolution. While Liberty Cap appears to be some sort of sculpted stone, it in fact was at one time a hot spring, just like the features nearby.

To receive logging approval for this Earthcache, please email us the following information:

1. Contrast the shape, size, and structure of Liberty Cap to the shape, size, and structure of the Lower Terraces. PLEASE DO NOT DESCRIBE THE LOWER TERRACES AS TERRACES, OR TERRACED, OR TERRACE-LIKE! Be descriptive! Be imaginative! Pretend that you are traveling with a blind companion and are painting a verbal picture for your friend. We are VERY much into the verbal descriptions of the Cap and Terraces, so don't sell yourself short by just using two or three words for each... we'll ask you to try again. Next, how do the Cap and the Terraces differ from each other in their formation? What caused this difference?

2. Now compare the color of Liberty Cap to the colors visible in the Lower Terraces. What colors do you see at each site? What causes these colors? Why is there such a difference between the colors of these two features?

3. What type of structure is Liberty Cap? We are not looking for the name(s) of the mineral(s) that comprise the Cap but the geological term for the Cap itself. HINT: there is a sign right nearby with the answer! Optional: name a geothermal attraction in the Upper Geyser Basin that bears a similar feature.

4. Take an altimeter reading from the trail that is level with the base of Liberty Cap. What is this reading? Now observe Liberty Cap. How tall is it? Next, observe the sedimentation level at the Terraces... this will take several minutes but is necessary to complete this question. Based on how long it takes to build up some noticeable sediment at the Terraces, how long did it to build up the Liberty Cap? NOTE: a 2013 research study pinpointed the Cap's "age." The park chief geologist asked us to note here that all books and articles originally printed prior to 2013 will be outdated and incorrect... but that visitors should not be using books anyway, just onsite resources (including rangers and visitors centers).

5. Optional: Post a photo of you or your GPSr with Liberty Cap in the background to accompany your log.

Team FMA created this Earthcache to share some of Yellowstone's geology with you, not to create a photo op that comes with a smiley. If you do not plan on submitting your responses within 24 hours of logging this Earthcache as found — or if you need more time because you are still traveling — then please use the "write a note" option instead. "Write a note" will give you all the time you need to complete the additional logging requirements for this Earthcache. Found logs that are not followed within 24 hours by ADL submission will be deleted; sorry, no freebie smileys! If you submit answers that are partially (or completely) incorrect, you will be given two weeks' time to correct them. We are happy to give clues and hints to guide you towards the answers, but we will not just give the answers away! Please remember that Earthcaches are meant to teach visitors about the geology and natural science of a site. They are overseen by the Geological Society of America and are completely different from a regular geocache. You'll find full details about Earthcaching at

Finally, and this should go without saying, if you hated school as a kid/teen, disliked taking tests, or simply don't like science, please reconsider Earthcaching! Earthcaching involves on-site observation and research to learn about the showcased site's geology; logging an Earthcache involves correctly answering questions about your observations and research. If you don't want to put in the effort required to Earthcache, please skip our ECs! Thank you for your cooperation and enjoy your visit to Liberty Cap.

Thank you for visiting our Earthcache! Remember that, for your safety and for the preservation of Yellowstone's geothermal features, it is vital that you stay on the provided trails. The ground around the Mammoth Hot Springs and park geyser basins is very fragile and it is not known when or where a new geothermal feature may suddenly appear... or an old one reactivate. The last thing you want on your vacation is to be parboiled because you fell through the crust.

Team FMA thanks E-people for being the First to Find our Liberty Cap Earthcache!

Placement approved by
Yellowstone National Park

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Additional Hints (Decrypt)

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2. Gurer vf nyfb n enatre-yrq jnyx guebhtu gur Greenprf naq ol Yvoregl Pnc gung vf irel urycshy!

3. Qba'g sbetrg gb jngpu sbe gung urycshy fvta! Gurer znl rira or nabgure urycshy fvta gb nvq lbh jvgu cneg bs dhrfgvba 4.

4. Gur pbybef ner abg qhr gb zvarenyf!

4. "Zvarenyf" vf abg gur nafjre gb dhrfgvba 2.

Decryption Key


(letter above equals below, and vice versa)



639 Logged Visits

Found it 609     Didn't find it 1     Write note 27     Publish Listing 1     Owner Maintenance 1     

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Current Time:
Last Updated: on 3/5/2018 8:44:43 AM (UTC-08:00) Pacific Time (US & Canada) (4:44 PM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum

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