As a child I was fascinated by the idea that the cliffs of Moher (https://www.cliffsofmoher.ie/about-the-cliffs/geology/ https://www.cliffsofmoher.ie/about-the-

As a child I was fascinated by the idea that the cliffs of Moher (https://www.cliffsofmoher.ie/about-the-cliffs/geology/ https://www.cliffsofmoher.ie/about-the-cliffs/geology/) stood at the mouth of a massive ancient river but I've never found a picture of the earth in the geological past which showed such a river. Nor does this model. Anyone know enough about geology to explain why? Is it because rivers are not represented at all?