A field day cut short by angry camels and a threat of rain … but at least the dust is gone!

MITZPE RAMON, ISRAEL–Compare the image above to the one taken in the same place two days ago. Much better! Our only dust today was a local product from the unending winds. The Saharan dust is gone. We paid for this clarity, however, with a dramatic drop in temperature. It was 8°C (46°F) when we started work this morning. This is typical for spring fieldwork in the northern Negev. The weather is less predictable, and the temperatures can swing wildly from day to day. The summers are very predictable: sunny, hot, dry, and not a breeze. I don’t take my hat’s chinstrap in the summers, but in the spring it is tied firmly all day.

Our goal today was to travel as far south as we could along the strike of the Matmor Formation, sampling “subunit 51” when we could. Melissa and I walked into the makhtesh about five kilometers. This was not a long distance, but in the summer we just couldn’t carry enough water to pull it off without a four-wheel drive vehicle.

We walked south from the Negev Minerals mine, where we park, along an old pipeline road until we reached Wadi Hatira (shown above). This is the wadi that drains the makhtesh through its single opening in the northeast. It is the greenest zone in the structure because it has the most soil moisture. There were some beautiful flowers along its banks, photos of which I’ll post later. From the wadi we climb up to the old British road and continue south into the Matmor Hills.

Melissa is standing above at the base of Subunit 51 of the Matmor Formation (Middle Jurassic). This is typical of its exposure in the central part of the makhtesh where there is higher relief in the Matmor Hills. The unit is difficult to follow because of an abundance of small faults cutting perpendicular to strike. Its marly nature means it is often covered with debris from the units above. The northern outcrops have lower relief, which in our case means we have more gentle slopes to search for fossils.

Around noon we ran into a camel herd wandering around our outcrops. (The most active of the beasts is shown above.) They had calves with them and were immediately disturbed by our appearance. They started to make angry camel noises. We did not want a run in with riled-up camels, nor did we want to give their Bedouin herdsmen any reason to think we were harassing them. Since the camels weren’t going anywhere, we reluctantly turned around and headed back.

To aid our decision to retreat, the skies looked very threatening (see above). Rain? Who would have thought? We could smell rain and see what looked like rain to the northeast. We did not want to be in a big rock bowl if it really did pour, so we hastened back to the car. It didn’t actually rain on us, but it may have in the makhtesh after we left.

We got a minimum amount of work done today, though, so it was not a loss. Now we’re back in our warm rooms listening to the wind continue to howl outside.

Posted in Uncategorized | Tagged , , | 2 Comments

Wooster Geologists in the Wilderness of Zin

MITZPE RAMON–Three times we cross Nahal Zin (or Wadi Zin) on our way to Makhtesh Gadol from Mitzpe Ramon. Nahal Zin is an intermittent stream, meaning it is dry most of the time, but during the rainy season can have a considerable flow, even to the point of flooding. I’ve always seen it bone dry. Nahal Zin is 120 kilometers long with impressive canyons in its upper region and meandering channels in its lower parts. It is the largest wadi that begins in the Negev.
The significance of Nahal Zin is that it is the defining feature of the “Wilderness of Zin” from biblical times. There is still some dispute about its location among biblical enthusiasts, but experts agree that it is essentially the northern portion of the Negev. The passions among the amateurs have much to do with the historicity of the Exodus events. This region was explored by T.E. Lawrence just before he became Lawrence of Arabia.
Google map image of Wadi Zin near Avdat. The red asterisks mark where it crosses Highway 40.

The Wilderness of Zin was on the southern border of Judah and is mentioned several times in the Hebrew Bible. Here are three:

“So they went up, and spied out the land from the wilderness of Zin to Rehob, to the entrance of Hamath.” (Numbers 13:21)

“The children of Israel, even the whole congregation, came into the wilderness of Zin in the first month: and the people abode in Kadesh; and Miriam died there, and was buried there.” (Numbers 20:1)

“The lot for the tribe of the children of Judah according to their families was to the border of Edom, even to the wilderness of Zin southward, at the uttermost part of the south.” (Joshua 15:1)

(Courtesy of Biblos.com)

During our work in the Negev we do not usually see much of biblical relevance, so living and working in the Wilderness of Zin reminds us of just how deep the human history here runs.

Posted in Uncategorized | Tagged , , | Leave a comment

A silent desert friend on the outcrops

MITZPE RAMON, ISRAEL–This exquisite snail is not a fossil, although students in the field often mistake it for one. (Melissa did not, I quickly add.) It is a terrestrial, air-breathing pulmonate snail called Sphincterochila boissieri. It is abundant in parts of the Negev and the Sinai Peninsula. Its shell is relatively thick for a land-dwelling mollusk, so it becomes a common constituent of the desert soil in certain habitats.
Sphincterochila boissieri is well adapted to its desert environment. It has a predator-resistant shell with a small aperture to reduce moisture loss. With its white color it reflects significant amounts of solar energy, staying relatively cool. (Compare this to the black ground beetle in the last post. It is most active in the winter and stays in shady areas during the summer.) They are active for only a few days during the winter rainy season, doing all their feeding (on algae, moss and lichens), mating and egg-laying. For the rest of the year they stay dormant, often in the soil or attached to rocks and woody plants. While dormant, they pull all the way back into the second and third whorls of their shell to stay as moist as possible. They can survive droughts, and thus do no feeding, for at least six years.

So, S. boissieri may not be one of our fossil targets, but it is a silent (and completely unmoving) companion during our fieldwork. It has our respect!

References:

Yom-Tov Y. 1971. The biology of two desert snails Trochoidea (Xerocrassa) seetzeni and Sphincterochila boissieri. Israel Journal of Zoology 20: 231-248.

Shachak M., Chapman E.A. and Orr Y. 1976. Some aspects of the ecology of the desert snail Sphincterochila boissieri in relation to water and energy flow. Israel Journal of Medical Science 12: 887-891.

Posted in Uncategorized | Tagged , , | 2 Comments

Negev and Mojave Desert ecological analogues

MITZPE RAMON, ISRAEL–One reason why I like working in the Negev is that it was already familiar when I first visited in 2003. I grew up in the Mojave Desert of southern California, which is very similar to the Negev in many ways. The ecological analogues between the two deserts are astounding, from “jackrabbits” to “sagebrush”. The ground beetle above is a type we see in abundance here in Israel. Anyone from the Mojave Desert would immediately recognize it from the color and behavior as what we called a “stink bug” as kids. They move frenetically over the hot ground with their heads down and abdomens high. Below is an example of a Mojave equivalent: a Desert Spider Beetle (Cysteodemus armatus). It is ordinarily black but is covered with yellow pollen in the spring. We saw this beetle on our departmental Mojave Field Trip a year ago.

When I post images of the Negev wildflowers we’ve seen there will again be familiar to Americans — some almost identical to Mojave equivalents. These analogues show how similar selective pressures can produce very similar effects in unrelated groups.

Posted in Uncategorized | Tagged , , , , | Leave a comment

Wooster Geologists in Paleontological Heaven

MITZPE RAMON, ISRAEL–The above is an untouched view of an eroding marl of the Matmor Formation (Middle Jurassic) in Makhtesh Gadol. I simply placed a one shekel coin in the scene for scale. This is why we love this place — the fossils are just rolling out of the outcrops (once you know where to look). Our ultimate goal is to describe the communities in this particular unit, and you can see that we have rich material to work with. You can try to identify the fossils you see here. I’ll give the answers below!

Melissa walking across the northern end of Makhtesh Gadol through the middle part of the Matmor Formation. You can see in the distance that dust (and the wind that brought it) is still an issue.

Ready for the answers to the fossil quiz above? 1 = scleractinian coral; 2 = Apiocrinites (crinoid) calyx base; 3 = Apiocrinites calyx plate; 4 = terebratulid brachiopod; 5 = Apiocrinites stem fragment; 6 = echinoid spine; 7 = oyster; 8 = Apiocrinites calyx plate; 9 = another kind of oyster.

In a close-up yet another type of brachiopod is visible. The red circle shows a thecideide brachiopod (no doubt Moorellina negevensis) attached to a crinoid column.

Cool, eh? And this is just a taste of what we saw today. Heaven indeed.

Posted in Uncategorized | Tagged , , , | 6 Comments

Another dusty day of fieldwork in the makhtesh

MITZPE RAMON, ISRAEL–It was a little warmer today in Makhtesh Gadol, but the sun was still obscured by the dust blown across the southern Mediterranean from the Sahara Desert. I may have an innate tolerance for dust from my childhood in the Mojave Desert, but this particular dust triggers a kind of hay fever for me. Maybe it is because Saharan dust is rumored to have a significant fraction of insect parts!

The top image is from the Mt. Avnon overview of Makhtesh Gadol (looking south along the west wall). The road below was built by the British in the early 1940s in an attempt to find and exploit oil from the makhtesh structure. The road is very well built and has survived with relatively little repair beyond paving it. It is astonishingly narrow, though, especially when you meet large mining trucks and tour buses on it. The trip down the most challenging portion was immortalized in a 2011 movie by filmaker Will Cary. Note the blue skies that summer.

Melissa and I located a series of outcrops in the Matmor Formation (Middle Jurassic) exposing “subunit 51”, which has a diverse crinoid-brachiopod community preserved in it. This assemblage has a very patchy distribution, so we want to see as many exposures of it we can to make certain we’ve collected a representaive fossil fauna. Ordinarily our outcrops of this marly subunit look like the one above. The yellow-brown color is distinctive, so it is relatively easy to find throughout the area. There is no hope, though, of seeing sedimentary and paleontological structures in such a loose sediment — it simply erodes too quickly.

We found one site, though, where subunit 51 is preserved in a cliff (above), which prevented it from disintegrating in the usual manner. From Melissa’s hat on down is the top portion of this critical marl. We could see no structures in the featureless marl itself, but on the base of the limestone above there are infillings of a trace fossil known as Thalassinoides. These were probably created by burrowing crustaceans (likely shrimp) that dug down into the very top of our subunit 51 mud.

Our favorite fossil find of the day is this little rhynchonellid brachiopod shown below (likely Burmirhynchia) with a round hole in its dorsal valve. It is tempting to say this is a predatory borehole — the work of a carnivore of some kind — but we can’t tell for certain. It is not beveled on its periphery, so we can’t distinguish it from just a hole punched after death through the vicissitudes of burial, preservation or exposure. Still, it is fun to think of it as a fossil predatory interaction.

 

Posted in Uncategorized | Tagged , , , | 3 Comments

A dusty but successful start on field work in southern Israel

MITZPE RAMON, ISRAEL–Melissa Torma, our friend Yoav Avni (Geological Survey of Israel), and I just ended a productive first day in the field. The two of them are shown above in classic paleontological poses. They are collecting fossils from Subunit 51 of the Matmor Formation (Middle Jurassic) in Hamakhtesh Hagadol in the northern Negev. We found excellent crinoid stems and calyx plates, brachiopods, corals, sponges, echinoid spines, serpulid worms, clams, and oysters.The day was very windy but seasonably cool.

You might be wondering why the sky in the above photograph is not the usual bright blue for this region? It is because the air is filled with dust blown off the Sahara Desert to the eastern Mediterranean countries (see NASA image below from 2011). This is a common occurrence here in the spring when a storm system is on its way. In the course of a year, every square kilometer in Israel receives 30-60 tons of this dust. The storm will bring rain to northern Israel tomorrow and Wednesday, but it is very unlikely to break the drought here in the southern dessert.

Shown below is a curious fossil Yoav found at our new site in the Matmor Formation we’ve called (creatively) “halfway”. It is a crinoid stem with a pair of skeletal galls, each with several holes. It appears some organisms infected the living crinoid, which then responded by growing skeletal tissue around the offending critters. Eventually the walled-in organisms drilled their way out, leaving the holes. This is what it looks like, anyway. Feel free to speculate!

I’ve placed a slightly different view of the fossil below to show that these are not encrusters but rather echinoderm skeletal material.

We had a great day despite the pervasive dust and wind gusts. It feels so good to get back to a desert again.

Posted in Uncategorized | Tagged , , , | 2 Comments

Wooster Geologists in southern Israel for Spring Break fieldwork

It’s a low-light, iPad photo, but at least it shows Wooster geology junior Melissa Torma enjoying a fine meal in the Hotel Ramon of Mitzpe Ramon, deep in the Negev of Israel. We arrived here this afternoon after a 22-hour journey from Ohio. The hardest part for me was enduring the 10.5-hour flight and then making a quick transition to driving through heavy Tel Aviv traffic on our southern journey. It all went well, though, and we are safely in our rooms getting ready for our first day of fieldwork tomorrow.

Melissa and I are here to measure sections and collect specimens for her Senior Independent Study project involving the description and paleoecological analysis of a Jurassic brachiopod-crinoid community in the Matmor Formation of Hamakhtesh Hagadol. I’ve collected these crinoids before here, and now Bill Ausich of Ohio State University and I are describing them as a new species of Apiocrinites. Melissa and I want to find more specimens (we hope more complete specimens) of this crinoid and place them in the context of the entire marine community they inhabited. Our partner in this effort is again our friend Yoav Avni of the Geological Survey of Israel.

When we left the USA yesterday there was a series of violent actions between terrorists in Gaza and the Israel Defense Forces. You may hear about rockets from Gaza striking southern Israel, but they are far from us. We see no evidence of the fighting here. We are very safe in the vastness of the Negev Highlands.

Posted in Uncategorized | Tagged , , | 2 Comments

Wooster’s Fossil of the Week: An ichthyosaur vertebra (Middle-Late Jurassic of Wyoming)

It’s only half a bone, but the above is one of my favorite fossils. This is a vertebra of an ichthyosaur, identifiable by its figure-8 cross-section. It is from the Sundance Formation (Middle-Late Jurassic) of Natrona County, Wyoming … and is the first ichthyosaur bone I found. There is not a lot to go on with a single bone fragment like this, but luckily for me only one ichthyosaur has been found in the Sundance: Ophthalmosaurus natans (Marsh, 1879). (“Ophthalmosaurus” is sometimes spelled “Opthalmosaurus” in the literature, and the inconsistency maddens me.)

Finding the ichthyosaur bones on June 23, 2008. Image courtesy of my friend Paul D. Taylor at the Natural History Museum.
Ophthalmosaurus reconstruction (along with some nice ammonites) from Wikipedia. Image Creator: Dmitry Bogdanov.

Ichthyosaurs were magnificent animals that were contemporaries of the dinosaurs. Ichthyosaur means “fish-lizard”, but they were neither fish nor lizards but a unique type of marine reptile. Their streamlined bodies are excellent examples of convergent evolution with the unrelated dolphins and sharks.

Ophthalmosaurus is best known for its very large eyes, up to 10 cm in diameter, with protective bones called sclerotic rings. They probably used these eyes to see in deep, murky waters, or they hunted prey at night.
This view of vertebrae cut in half is from the first paper to describe ichthyosaurs: Home (1814). You can see the distinctive figure-8 shape, known professionally as “cupped vertebrae”. The ichthyosaur specimen Home presented was found by the famous Mary Anning and her brother Joseph. Home thought the animal was some kind of odd fish. Home and the Annings had much more than just these vertebrae, but I like the symmetry of their big discovery and my little one.
Sir Everard Home, 1st Baronet FRS, 1756-1832, was a British physician fascinated by anatomy. Besides the ichthyosaur, he is also known for the earliest anatomical work on the platypus.

References:

Home, E. 1814. Some account of the fossil remains of an animal more nearly allied to fishes than any of the other classes of animals. Philosophical Transactions of the Royal Society of London 104: 571–577.

Huene, F. von. 1922. Die Ichthyosaurier des Lias und ihre Zusammenhage: Berlin (Gebr. Bonrntraeger), 114pp.

Maisch, M.W. 2010. Phylogeny, systematics, and origin of the Ichthyosauria – the state of the art. Palaeodiversity 3: 151–214.

Marsh, O.C. 1879. A new order of extinct reptiles (Sauranodontia), from the Jurassic Formation of the Rocky Mountains. American Journal of Science, 3rd series, 17: 85-86.

O’Keefe, F.R., Street, H.P., Cavigelli, J.P., Socha, J.J. and O’Keefe, R.D. 2009. A plesiosaur containing an ichthyosaur embryo as stomach contents from the Sundance Formation of the Bighorn Basin, Wyoming. Journal of Vertebrate Paleontology 29: 1306–1310.

Posted in Uncategorized | Tagged , , , | Leave a comment

On Being A Female Geologist

Happy International Women’s Day! I’ve been reflecting on what it means to be a female geology professor ever since the Wooster Alumni Magazine featured an article on Annie Irish, the first woman on Wooster’s faculty. Her portrait graces the foyer of the Timken Science Library, so I see Annie every Research Friday, yet I’ve never really thought about her role (or mine) in Wooster’s legacy.

The portrait of Annie Irish that presides over the Timken Science Library entry.

Annie clearly made an impact on the Wooster community and was much loved on campus. According to an 1897 Wooster Alumni Bulletin, her portrait was a gift given by alumni (Annie’s former students) to Hoover Cottage. Women’s cottages were one of the many ways that Annie advocated for female students. She envisioned campus housing that would help female students feel comfortable and develop networks. Annie’s legacy is carried on by the Women’s Advisory Board, established in 1892, which provides financial support for international and female students.

Supporting the education of women is a longstanding and widespread issue, particularly in the Science, Technology, Engineering, and Mathematics (STEM) fields. Every two years, the National Science Foundation (NSF) compiles a report on the status of Women, Minorities, and Persons with Disabilities in Science and Engineering. They’ve found that women are participating in the physical sciences and mathematics at relatively low levels. Although the percentage of physical science degrees awarded to women has grown since the early 1990s, women are still earning those degrees at relatively low levels compared to men.

Percentage of degrees awarded to women in the physical sciences and mathematics between 1990 and 2008. Source: Women, Minorities, and Persons with Disabilities in Science and Engineering: 2011.

The participation of women in the sciences can be broadened by funding agencies that make it a strategic goal at all academic levels. The NSF ADVANCE program, for example, supports projects that encourage women to pursue academia as a career. Some ADVANCE projects, like MU-ADVANCE at my undergraduate alma mater, make changes at the institutional level. Other ADVANCE projects support women by establishing and maintaining partnerships. The Earth Science Women’s Network is just one example of an ADVANCE project that provides peer-mentoring opportunities for female scientists. At the undergraduate and graduate levels, the Clare Boothe Luce Program supports women who are pursuing degrees in science, engineering, and math. Just this year, Wooster had the good fortune to designate four female science majors as Clare Boothe Luce Research Scholars, who will be provided funding to conduct research and travel to conferences.

Funding isn’t the only strategy for supporting female scientists; women need strong role models and effective mentoring. The Association for Women Geoscientists (AWG), for example, is one organization that not only awards scholarships, but also sponsors outreach activities and facilitates mentoring. I didn’t discover AWG until graduate school, which is where I first encountered female geology professors (with the exception of one fabulous female geoscientist who ran an REU that changed my life). This isn’t to say that my undergraduate professors were poor mentors; I just wonder how my perspectives (and those of my classmates) would have changed if we had had a female role model.

Fortunately, strong female geoscientists are somewhat easier to find today. In fact, half of the Wooster Geology Department consists of female faculty members, and this is where I might find my legacy at Wooster. I can encourage women to pursue the geosciences by sharing my experiences, connecting them to resources, and helping them realize their potential. A quick glance at the list of recent College and Departmental award recipients reveals a talented group of female geology majors:

Tricia - One of the four Clare Boothe Luce Scholars from The College of Wooster.

Lindsey - Co-winner of the 2012 Charles B. Moke Prize for showing the greatest improving during her college career.

Sarah - Co-winner of the 2012 Charles B. Moke Prize for showing the greatest improvement during her college career.

Anna - 2012 Karl VerSteeg Prize winner, awarded to the major who has the highest general standing in the middle of the junior year.

Congratulations to these talented young geologists! You are examples of promising young women who enhance the image of female geoscientists everywhere.

UPDATED (11:55 PM): Looking for other posts on female geologists? Try  Looking for Detachment’s 2010 post on Cornelia Clermont Cameron or Scientific American’s post on Geologizing Women. Thanks to @sfoxx for the links!

References:

Dixon, M. 2012. Reconstructing Annie. Wooster 126: 28-31.

Scovel, S.F., and Compton, E., eds. 1897. Alumni Roundtable. The Post-Graduate and Wooster Quarterly XI (4): 339-354.

 

Posted in Uncategorized | Tagged , , , | 3 Comments