Topo map symbol identification help

[xracer550]

I have been looking around this topo map & see quite a few of these symbols some atop of hills some in valleys , I can't find this image can someone identify ?

 

[robertk]

Possibly a cave? I've seen cave symbols that are the same shape, but with the semicircle filled in.

 

[russau]

I can't remember the name of the explanation directions that are given when you order the topo maps from the USGS form BUT it does have a name for all those symbols on these maps maybe try to goggle info about these symbols at the USGS site to find out what's up ! Good luck ! we wanna know also !

 

[Mackaydon]

What does an aerial photo tell you about those symbols?
The symbols are shown on a map KEY or LEGEND.
Don in SoCal

 

[freeman]

I have been looking around this topo map & see quite a few of these symbols some atop of hills some in valleys , I can't find this image can someone identify ? View attachment 2220113

Omega letter symbol on a topo map means a cave or cave entrance.

 

[Mackaydon]

Yes, a symbol for a cave as mentioned above.

Intro: Origin of the Symbols

Underground tourist destinations of the World

www.showcaves.com

As a WAG, it might also represent a mine entrance.
Don in SoCal

 

[russau]

Thankyou for informing us on the "where to go to find the .............. !

 

[Red-Coat]

It's not a standard USGS symbol (see below), but map-makers often have their own key symbols which aren't standardised across all publishers.

It looks more like a cave entrance than a mine, but if you want to be absolutely sure, you'll need to find a map from the same publisher that includes a table of the keys they use. Does your map include the name of the publisher?

 

[xracer550]

Most of the maps I see use the symbol that Red-Coat show's but I did find the symbol on another map , Yes it is a shaft or a tunnel opening . Thank's for your help .

 

[bc5391]

It could be a cave as mentioned, but also being in a mining area, I would put my money on an Adit., which is a horizontal opening into a mine, vs a shaft which is vertical, the square..