So, I wrote a query to the author (Stephanie Redmond) re: her position. Here is her response:
This book also uses the young earth philosophy. My approach is to believe the Bible first and then filter science through that. I believe there was a world-wide flood. From that perspective, I can then accept that massive amounts of earth and life would be moved at rapid rates, creating all manner of layering and even moving continents. Please note: I am not a scientist. I do not go into this deeply, but rather try to show students what the Bible says and that not all scientists agree. "Many scientists who are Christians agree that the worldwide flood that is described in the Bible could have caused the separation of the continents. In this case the world would not have to be millions of years old. Such a flood could have caused the continents to move apart very quickly. This still allows room for the Pangea theory." (from Lesson 3 - Plate Tectonics) At all points, my goal is to show that being a Christian does not negate good science and that science does not negate the Bible.Even though I can't necessarily recommend this textbook from an old-earth creation standpoint, I want to publicly thank Ms. Redmond for taking the time to write me back and clarifying her position.