Mobile Can't find altars

[stealth2953]

Hi, I can only seem to find one demon altar in my world. Any easy ways to find some? Thanks.

Here are some screenshots of my corruption area(it has been taken over by Hallow when hardmode started.

 

[darthmorf]

They're normally found in the corruption chasms (in the horizontal sections).
A screenshot of your map would help us to point to where there might be some.

 

[stealth2953]

They're normally found in the corruption chasms (in the horizontal sections).
A screenshot of your map would help us to point to where there might be some.

I checked the horizontal sections, but are no altars there.

Edit: Screenshots are up: take a look in OP

 

[darthmorf]

Hard to tell from just that - how about one of the hole world?