A Rocky History Read Backwards

Writers in Western culture have long employed the metaphor of a "book" for depicting the natural world, with we being "readers" of that "book."  Theologians in both Christianity and Islam have said that the "Book of Nature" might even speak to us something about God.  It was a famous scientist, however, who in 1859 drew upon the "book" metaphor to explain an aspect of the geological record.  In Origin of Species, Charles Darwin wrote:

"I look at the natural geological record... as a history of the world imperfectly kept,

 and written in a changing dialect; of this history we possess the last volume alone....

 Of this volume, only here and there a short chapter has been preserved;

 and of each page, only here and there a few lines."

Darwin was having to explain why -- unlike, other books that we haven't finished reading -- we know more about the last pages of the book of the Earth's geology than about the first.  Today, geologists have succeeded in reading more and more of those pages, going further and further back, despite the fragility of many fossils, and the fact that fossils were created only under special circumstances.  This geological "history book" is being read from the back towards the front.

It was not along a book-like, historical narrative that I first encountered the science of geology.  Instead, I first experienced the identity of rocks in compartmentalized categories. When I was of upper elementary-school age, I was given a boxed set of rocks.  It consisted of a white, plastic tray of 15 thumb-size rocks, each one in its open-topped compartment.  The makers of the set, knowing that children would want to take the rocks out of their cubbyholes, wisely managed to adhere a small, identifying nametag to each rock.

 I found the differences between those unpolished rocks fascinating.  White gypsum.  Yellow sulfur.  Black coal.  Even the feel of each one was different.  Despite that childhood enjoyment, when I had some brief encounters with geology books in high-school and college, I could never get the rocks to "speak" to me.  When those books tried to explain geological history, I could not create a powerful enough mental picture because those geological layers were out of sight, underground.

That changed one day when my wife and I were driving slowly through a mostly desert area of Big Bend Natl. Park in southwest Texas.  When our car turned around the corner of  a small projecting mass of rock that had been hiding part of our view, my wife exclaimed, "That field's growing boulders!"  And how striking indeed was that area of desert beside our car.  It was a flat, tan area of desert, on which it looked as if a giant had been playing with a set of dark-brown marbles ranging from one foot to several feet in diameter.  It was if the surface of the Earth had been turned inside out, with those out-of-place boulders shouting a message about how their lives that had once been underground.  Yet they now stood there before us, unmoving, like a moment frozen in time. A book held open to one page so that we might read it more carefully

~~~

Have you ever seen rocks or geological structures that were fascinating to you?

(The Darwin quote is from the last paragraph of

 Chapter IX of Origin of Species [orig. 1859].)