This might be somewhat backward, but how can one get the post type being displayed on an archive page? Alternatively, how can one get the post type associated with a given taxonomy?
1 Answer
get_queried_object() is your friend. It will tell you all kinds of information about what your template files are trying to do. From within, you can discover your post type. Try doing a var_dump to take a look at that object.
As for your second question, taxonomy is not, as far as I know, isolated to one post_type, so that is not really something one can assume. For example, “location” may be a taxonomy to both post types: “Restaurants” and “Grocery Stores”.