Showing posts with label geology. Show all posts
Showing posts with label geology. Show all posts

Monday, May 27, 2019

Enerdyne and Brain Storm in Suttons Bay

While visiting family May 17-20, I stopped in at Enerdyne to shop for an optical adapter for my telescope. They were very helpful. They found the part that I needed. I also bought two pairs of small forceps (“tweezers”) and four bar magnets.

Enerdyne sells Petoskey stones, but I did not see any out on display. So, I went next door to Brain Storm and found one there. While at Brain Storm, I bought a game, "Word A Round," for Laurel and me.

Elaine and Stu were working the store on Saturday.
Dick Cookman, formerly a science instructor
at Northwestern College, is the owner.


















PREVIOUSLY ON NECESSARY FACTS


Thursday, March 10, 2016

Before Darwin

John Leonard Riddell (1807-1865) completed a bachelor's degree at Rensellaer Academy and was later granted a master's for his field work in botany. He earned doctorates in medicine from the Ohio Reformed Medical College (1834) and from the Medical College of Ohio (1836). He taught chemistry at the University of Louisiana (1839-1865) while at the same time he served as chief melter at the New Orleans Mint (1839-1848). Though loyal to the Union, he was the postmaster at New Orleans during the Confederacy.


“Marine and lacustrine beds of marly earth, formed unknown ages ago, are often met with, which, under the microscope, prove to consist, sometimes, wholly of the sileceous shells of diatomaceous animalcules, frequently bearing a precise resemblance to the living forms which now abound in all our stagnant waters.  But in the more conspicuous fossil remains occurring in the geological strata of different ages, important modifications of structure are apparent; certain species of animals and plants prevailing for a while, becoming extinct, and being succeeded by others of a modified type.

“Without unduly dwelling upon this subject, it is worthy to be remarked, that at least one great lesson may be learned from the study of these organic remains; especially from contemplating those of the more highly organized types, namely: That as we, in the brief day of our actual observation, have seen organic individuals begin and end their respective lives; organic varieties, as of fruit, &c., appear, flourish, and decay; and even organic species to become extinct, as the Dodo and the Irish Elk; so may we infer, from the inspection of the remains of successive extinct races of beings, that all species or kinds, as such, have begun their career, will flourish for, we know not how long, and will ultimately decay and disappear; their places to be supplied by modified species and kinds.

"The observed average duration of individual beings varies, from a few hours, as is exemplified in the minute world of life revealed by the microscope,--as in the Vorticella ramose, different species of Mucor, &c.,--to a few centuries, as is inferred to be exemplified in whales, elephants and forest trees. What naturalists call varieties, possess a duration extending, more or less well marked, through, perhaps four or five generations of individuals. Species, so called, have a much longer life. Concerning the average duration of species, nothing very reliable is known; perhaps a thousand successive individual generations might retain to the last, the essential specific characteristics. To pursue this subject further, by attempting to conjecture the duration of organic races and natural orders, would be profitless, inasmuch as mere conjecture would alone provide  us foundation to build upon. Nevertheless, a careful study of the organic remains which geological researches have brought to light, give strong color of truth to the general conclusion, that all organic matter is in a state of continued change; the progress of which, though often too slow for our direct appreciation, is, in the limitless flight of long successive ages, not the less certain.”

J. L. Riddell, M.D., Professor of Chemistry, Introductory Lecture, Delivered on November 18th, 1851, Before the Medical Class, University of Louisiana, New Orleans, “On Our Knowledge of Nature, the Natural Sciences, and certain Truths revealed by the Microscope.”

PREVIOUSLY ON NECESSARY FACTS

Friday, January 29, 2016

In Suspect Terrain

According to most geologists, plate tectonics explains the major features of Earth’s surface. Continental land masses floating on the magma mantel crash into each other over hundreds of millions of years. This forms mountains, and therefore valleys, of course. The mountains wear down. Their rocks are ground fine, mixed with vegetation and animal remains, and become topsoil. Several times, oscillations of glaciers moved forward and retreated, carving valleys, forming rivers and lakes, and then melting. In their reversals, they left behind huge boulders and other “exotic” materials.  Geologist Anita Harris used to believe that, also. Over the course of her career, she came to doubt that the story is so simple.  Plate tectonics has a place. It does explain some facts. It does not explain everything.

Like medieval astronomers adding epicycles to fit their ever-better measurements with astrolabes, the modern geologists posit smaller, localized land masses that bump into continents in order to explain mountain ranges and other features that would contradict plate tectonics.

I confess that my geology is weak. I do not have it in my head. I rely on websites such as this one from the University of California at Berkeley to remind me which came first, the Silurian, Ordovician, or Cambrian.

It did not detract from the book. I read through almost all of it with only a few stops.  The bigger picture is easy to perceive.

John McPhee’s biography of Anita G. Harris is also a geological travelogue through the eastern United States. Harris was born in Brooklyn. The sands of Coney Island have garnet in them. McPhee and Harris travel through the Alleghenies, down into Ohio, across into Illinois.  The book opens with an eastward journey and then treks back.  That meandering narrative has islands of detail about  Harris’s career, and her marriages to other geologists.

(You can find a list of her 32 papers in 25 years papers here.

Like Irons in the Fire, about modern cattle rustlers, and The Curve of Binding Energy, a biography of John Wheeler, In Suspect Terrain immerses the reader in McPhee’s experience of a new subject.  He is an able student, and an engaging teacher.

Geology is not easy. One of my criminal justice instructors said that cops at a crime scene do not spend enough time with dirt and glass.  So, I took a geology class. It was a “local lab” course with a lot of outside work in our own neighborhood. For the semester project, we went to a quarry and assembled collections of fossils.  (Someone gave me a trilobite. I never found one on my own.)  I thought that I would learn the local rocks and minerals like the stars in constellations. Nope. Geologists keep tons of rocks labeled in cases because of the enormous inventory of types and kinds.  You can learn the easy ones: igneous, metamorphic, sedimentary… obsidian, marble, limestone, granite, flint, … After that, you have to love categorizing and cataloguing. It is as bad as biology. Contrary to physics and mathematics, geology is a study that rewards maturity, rather than intuition. Anita Harris’s woe is the armies of young geologists lured by the Siren song of plate tectonics.

PREVIOUSLY ON NECESSARY FACTS


Sunday, October 12, 2014

Anthropocene: bad name for a good thing


The Age of Man: humanity as a global culture; our cities a new environment, a new ecology, an invented eco-system.  It is inspiring.  But it is wrongly named. 

Recent articles from popular scientific literature delineate the problem.  “Is Civilization Natural?” by Adam Frank aired on NPR, September 26, 2014.  That is how I first learned the word in my car the following day.   

Reading the blog transcript, I followed the links and searched on my own.  I found a National Geographic story from 2011, “Enter the Anthropocene-Age of Man” by Elizabeth Kolbert.  In its January 2013 issue, Smithsonian Magazine asked rhetorically, “What is the Anthropocene; and are we in it?” by Joseph Stromberg. 

First, is the presence of human civilization remarkable in geologic time?  Second, if so, what is the proper name?  The second problem is only hinted at.  No one seems to have offered a better label.  As for the first, it depends on whom you ask. 
 
Earth from Space. Apollo 8.
No indication that it is inhabited.
According to National Geographic, the word “anthropocene” was invented spontaneously by Paul Crutzen, a Nobel laureate chemist. 
The conference chairman kept referring to the Holocene, the epoch that began at the end of the last ice age, 11,500 years ago, and that—officially, at least—continues to this day. "'Let's stop it,'" Crutzen recalls blurting out. "'We are no longer in the Holocene. We are in the Anthropocene.' Well, it was quiet in the room for a while." When the group took a coffee break, the Anthropocene was the main topic of conversation.”
 In truth, Crutzen has been thinking about this for about 40 years.  His first listing in JSTOR is “SST’s – A Threat to the Earth’s Ozone Shield” in Ambio, vol. 1 no. 2, April 1972.  SST refers to the Concorde supersonic transport, a commercial experiment that ran for 27 years, from 1976 until 2003.  Only 100 were ordered, 20 built, and seven put into service.  When Crutzen wrote in 1972, they were four years in the future.

Crutzen continued to research atmospheric chemistry, and was honored with a Nobel prize, in 1995, along with Mario Molina, and F. Sherwood Rowland, for his work on ozone depletion.  But he is not a geologist.

The –cene words all mean “recent.”  From the Tertiary Period through the Quaternary Period, the Epochs are called (oldest first):  Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, and Holocene.  They mean: oldest recent, dawn of the recent, slightly recent, more recent, most recent, and wholly recent.  (Idaho Museum of Natural History here.)
 
Earth at Night
Evidence is where you find it.
Stratigraphers define geologic layers by the rocks, of course, but also, more accurately, and precisely by the fossils.  (See The Map that Changed the World reviewed here on NecessaryFacts.) Some stratigraphers were not happy with the neologism “anthropocene” that popped up in the scientific literature.  Others may have settled themselves to it. It depends on whom you ask.  
“Many stratigraphers (scientists who study rock layers) criticize the idea, saying clear-cut evidence for a new epoch simply isn’t there. “When you start naming geologic-time terms, you need to define what exactly the boundary is, where it appears in the rock strata,” says Whitney Autin, a stratigrapher at the SUNY College of Brockport, who suggests Anthropocene is more about pop culture than hard science. The crucial question, he says, is specifying exactly when human beings began to leave their mark on the planet: The atomic era, for instance, has left traces of radiation in soils around the globe, while deeper down in the rock strata, agriculture’s signature in Europe can be detected as far back as A.D. 900. The Anthopocene, Autin says, “provides eye-catching jargon, but from the geologic side, I need the bare bones facts that fit the code.”  (Smithsonian Magazine.)
“At first most of the scientists using the new geologic term were not geologists. [Dr. Jan] Zalasiewicz, [University of Leicester] who is one, found the discussions intriguing. "I noticed that Crutzen's term was appearing in the serious literature, without quotation marks and without a sense of irony," he says. In 2007 Zalasiewicz was serving as chairman of the Geological Society of London's Stratigraphy Commission. At a meeting he decided to ask his fellow stratigraphers what they thought of the Anthropocene. Twenty-one of 22 thought the concept had merit.” (National Geographic)

(See, also, “The Anthropocene: a new epoch of geological time?” by Jan Zalasiewicz, Mark Williams, Alan Haywood, and Michael Ellis. Philosophical Transactions: Mathematical, Physical and Engineering Sciences, Vol. 369, No. 1938, (13 March 2011), pp. 1056-1084, by The Royal Society.)

Geologic stages are shorter than epochs and they tend to be named after the places where the layers were first explored, even if similar layers are found elsewhere: Piacenzian, Gelasian, Calabrian …  But the margins of error are still given as ± 0.005 million years, which means ± 5000 years, the time span of the so-called Anthropocene. 

Geologic time is not the only long wave.  The 1954 reference Earth as a Planet, edited by Gerard P. Kuiper, has no index entries for humans, animals, or plants.  About halfway through the 744-page work, in a chapter by G. E. Hutchinson of Yale, "The Biochemistry of the Terrestrial Atmosphere", is this passage:  “The carbon cycle, as it is commonly understood in biology, consists of the photosynthetic reduction of CO2 by green plants and a certain number of purple and green bacteria and the subsequent respiratory release by plants, bacteria, and a to a less extent of animals, of Co2 to the atmosphere.” (p. 379).

Man is the measure of all things.  But measurements must be appropriate.  The Moon is 384,403 km away, center to center, even though we do not travel from the center to the center.  Knowing that in millimeters does not give you much more information. 
 
Stars that have been touched by our
television signals
http://zebu.uoregon.edu/1996/ph123/l16c.html
Anthropocene means “Man recent”.  It violates the rules of nomenclature and is gendered.  Why not call this the Gynocene?  The word “people” ultimately comes from a doubling for intensity of the first syllable of “poloi” which means “many.”  (Pepper is another example: achoo!)   Linguists who theorize a common source for all Afro-Asiatic languages use the word “Nostratic” ultimately from the Latin nos for “we” and, so, “nostras” for we-folks, countrymen, natives, etc.  Homo-words carry too many other meanings. We have enough problems with homo erectus.  Civilization may be sine qua non of who we are.  It is not clear when, measured by paleontology, we became rational and self-aware, versus just being smarter apes.  And those may be two different events.  The recent discovery of cave paintings  in Indonesia that are 40,000 years old and similar to equally old works in Europe suggests much, but answers little. 

We have been radiating electromagnetic signals into space since 1840.  Voyager 2 has been on an “interstellar mission” since 1990.  Even though the sun will expand and burn the planet, some of our descendants may witness that.  And, just as we know Paleozoic millimeter-sized plants from their fossils, they too, may have evidence of our having been here now.  

ALSO ON NECESSARY FACTS


Wednesday, January 1, 2014

THE MAP THAT CHANGED THE WORLD

William Smith (1769 – 1839) drew the first geological maps of England. He was born into a culture that was certain that the world had been created at 9:00 AM on Monday, October 23, 4004 BC.  He died twenty years before The Origin of Species was published.  Yet, he invented the predictive science of geology by marking time with fossils.  In the hour of his success, his work was stolen shamelessly by the gentlemen of the Geological Society.  He was forced into debtor’s prison and spent 20 years homeless, working as best he could in the rural countrysides and counties far from London.

William Smith’s father was a blacksmith and so his formal education was minimal. But he was determined to make something of himself; and by 1794, he worked as a surveyor for the construction of canals.  Eventually and soon he was recognized as the man who could solve practical problems in draining farm fields and predicting where profitable coal fields were to be found.  He recorded his daily work in a continuous multi-volume journal. 

Those notes let him create a series of huge colored maps showing the rocks and strata of England.  (He eventually included more of Britain.)  The keys to his work are two interlocking discoveries.  First, the rock strata are uniform.  Everywhere the strata are the same. Even if some (unknown) process or force (apparently) has displaced or tilted the layers, they can be logically reconstructed into a continuity.  Second, while sandstones and marls and limestones and all the others are to be found repetitively layer upon layer in succession they can be differentiated one from another by the fossils within them. No identical fossil forms ever appear in two different layers of the same kind of rock.  Simpler forms of the same animals are found lower down. 


We know now that cycles running millions of years repeatedly created land, drowned it, and then lifted it up, separating some plates as others collided.  Smith knew nothing of that; and neither did anyone else.  The dilettante gentlemen who robbed Smith of his creation debated whether all rocks precipitated from the ocean or whether all rocks were born of volcanoes.  Anything more complex was beyond their range.  Smith, however, was not at all a British Empiricist.  The men who stole his work were.  Their chief, George Bellas Greenough, denied the validity of theory.  But Smith’s work depended on it. The gentlemen of the Geologic Society attempted to produce their own map (from Smith’s work) without theory, and failed.  They had to admit to the correctness of Smith’s method, as well as to the value of his labors.

Simon Winchester’s biography of William Smith takes you into the fields of England.  He stops to explore and explain.  His college degree from St. Catherine’s Oxford is in geology.  However, after exploring Greenland, among other adventures, most of his career has been in journalism.  (His website here.) Winchester has several popular books to his credit. I read The Professor and the Madman about the Oxford English Dictionary over a decade ago.  His most recent book is The Men who United the States: America's Explorers, Inventors, Eccentrics and Mavericks, and the Creation of One Nation, Indivisible.

ALSO ON NECESSARY FACTS