Hi kjk Virginia,
Re: "How to get rid of oval shape that appear in Pages on iPad?"
Am no expert in this area, yet you post deserves some reply
If you accidentally added a shape, see if you can just use "delete" to get rid of it ...
(ie: you may need to tap the shape first before you can choose to delete it)
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Re: "I don’t know what caused this shape to appear in Pages but I can’t get rid of it."
If you want: You can see how shapes can be added, so you know more about that:
See : Intro to images, charts, and other objects in Pages on iPad - Apple Support
and
How to add and edit shapes in pages
All the best :-)