December 8th, 2011 at 2:56 pm (Uncategorized)
This chapter discusses the rocks and fault present along the Bright Angel Trail. Distance is described in this chapter as "rods", which is a unit that was commonly used by surveyors at the time this book was written. It is equivalent to 16.5 feet.
November 15th, 2011 at 3:29 pm (Uncategorized)
This chapter discusses the views as seen from Yavapai Point.
November 1st, 2011 at 12:08 pm (Uncategorized)
This chapter explains the views of the Grand Canyon as seen from Hopi Point, not too far from El Tovar.
October 28th, 2011 at 12:44 am (Uncategorized)
This chapter describes the various geological views as seen from the historic El Tovar hotel.
October 27th, 2011 at 12:02 pm (Uncategorized)
This chapter discusses a very general history of the formation and deformation of the rocks that form the walls of the Grand Canyon.
At the time this book was written, the term "Algonkian" was still being used to represent a period of time between the Archean and the Cambrian, despite the proposal (from at least 1908) to the Geological Society of America that the term "Proterozoic", which is used worldwide today, be used to identify this era of geological time. As far as I can tell, the term "Algonkian" was only ever used to describe rocks of this time in North America. You can download a pdf of the geological time scale from the Geological Society of America here. One should also note that today there are far more than the 12 divisions of geologic time mentioned in this book!
October 6th, 2011 at 11:17 pm (Uncategorized)
"Formations" or layers of particular types of rock. This section of the book covers the various rock formations and where they can be see in the Grand Canyon. The photo is not particularly helpful, so I recommend referencing the cartoon stratigraphy here on the USGS park website.
September 20th, 2011 at 12:20 pm (Uncategorized)
"How was it formed?"
The origin of the Grand Canyon is a story of uplift and erosion over vast expanses of geologic time.
September 20th, 2011 at 11:50 am (Uncategorized)
Explains the purpose of the book, by N.H. Darton, and the purpose of this podcast.
September 19th, 2011 at 1:33 am (Uncategorized)
31st edition, published 1957
This is the preface of the book, there is no author listed for these two pages before the table of contents, but we can assume, based on Darton's name being used in the third person, that it was not written by him.