[Twenty Twelve] Remove post content from page of posts

Hello,

I’m working with a Twenty Twelve child theme – on each page of posts (including category and tag archives) I need to remove the text preview of the individual posts. I’ve already removed most of the meta material, but when I take the content out, it also takes it off the individual post pages, which is the only place I want it to appear.

http://testing.ampcommunity.com/posts/

I want the list of posts to just consist of

Post Title
Tag

Any ideas?

Thanks