Wikipedia:Articles for deletion/Social Hall (Alcatraz)
The topic is notable.  For example, https://books.google.co.uk/books?id=Z2dOAQAAIAAJ this source discusses the geology of this feature in detail.  See also ; ; ; ; 
— user:Andrew, 10:06, 13 February 2019 (UTC)
Stance: keep
Cited policy: WP:ATD||WP:BEFORE||WP:NOTCLEANUP||WP:NOTPAPER||WP:PRESERVE (Wikipedia:Deletion policy)