Examine the map of the Delightful Dells Geological Paradise. Refer to the map legend. What kind of rocks are found in this map area (circle all that apply)?
How many units can you see?
Draw a geological cross-section between the points X and Y indicated on this map. Note: you will have to prepare a cross-section from scratch for this exercise, but you can use the format from the Murky Mists cross-section as a guide. This is a more challenging cross-section and you may have to make several changes to get it right. Make sure you have an eraser with you!
Using the cross-section you have prepared and the distances between the upper and lower contacts for each unit, calculate the thickness of the following units. Mark the location where you measured your thicknesses with a line on your cross-section. Note: the thickness is the shortest distance between the upper and lower contact of a bed: a line that runs perpendicular to both contacts.
Why can’t you measure the thickness of the conglomerate or the limestone?
Describe the geological history of the map area, a bulleted list is OK to use here. Hint: start with the oldest event and describe events as they occurred up to the present day.
Figure 16.15: Derivative of “Delightful Dells Geological Paradise” (CC-BY 4.0; Karla Panchuk via OpenPress) by Chloe Branciforte