Below are some examples showing different ways of displaying announcements in a content channel. The only 2 fields you can show in a content channel on load are the headline and publish date, with custom label if desired. You click on the "more details" button to show the announcement description and author, if entered.

The only options available for this content channel type is show publish date and enter custom text for publish date field.

There is no archive or "show more announcements" button feature on content pages, but there is on portals.