My name is Yin. I met Yang during my travels. I decided that I would stay and keep him company. He is made of ancient material that may have come from the Crooked River Volcano eruption 30 million years ago. Unlike Yang, I am made of modern caching materials that will not withstand the test of time. I play an important role of being the cache container that you seek. I have a log, pencil and some swag for the travelers who come by to visit.
The code to our location is:
VEHJF IEHTJ QYWFC CVVYV CBTVX JCXEH JFICY OBF
UHVCB TVXJC XFUCV FIHVC CYOBF CCVQY WBTVX JCXQC NCVFI QCNCV
You will need to do a web search for How to make a pocket decoder.
Select the result that looks like:
[PDF] How to make your own pocket decoder - KPN home.kpn.nl/penn0071/pocketdecodermakeyourown.pdf
Yang, the ancient one, is protecting Yin. Please do not disturb him from his slumber. He takes frequent naps during the day. Ying is right behind him with easy access using a common geocache camo.
You can validate your puzzle solution with certitude.