How can I make a polygon from intersecting lines of different layers in QGIS?

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I am constructing a geological map which involves constructing boundaries to areas which vary in style across their length depending on how well defined they. To do this I have created two distinct layers called "certain" and "inferred", one solid the other dashed. I wish to automatically create a polygon fill surrounded by the boundaries, but when I use the lines -> polygon tool, I am only given the option to select one layer at a time.

Can I join the two layers together into one but retaining the changing style?

Alternatively, can I possibly change the style of the line within one layer, or can each layer only have one style?



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