Madeline Little’s URAP experience: A semester spent “plugging away” rehousing the UCMP tar pit collections!
During the Spring 2017 semester, I worked as an undergraduate research apprentice at the UCMP on the Berkeley Fossil Insect PEN project to organize and rehouse the digitized insect specimens from the Rancho La Brea and McKittrick tar pits. The UCMP McKittrick collection includes insect specimens collected as early as the 1930s, while the Rancho La Brea collection has insects dating from the late 1900s when the site was first referred to as Rosemary. At this writing, over 1,300 tar pit specimens have been digitized, with images and specimen records available in CalPhotos, the UCMP online database, iDigBio, iDigPaleo, and other data aggregators. These specimens included not only those digitized during the BFIP project, but also additional ones added this year as a direct result of BFIP’s digitized data being used by Anna Holden, a doctoral student at the Richard Gilder Graduate School of the American Museum of Natural History for her dissertation research on the paleoclimate of southern California since the last Ice Age.
During the earlier databasing and imaging stages of the project, individual insect specimens were sorted and placed in 1 x 3 inch specimen trays. Specimens curated under a previous grant had been placed in glass vials with plastic snap caps. However, because of the small size of the specimens, permanently storing them in the trays and vials would be a huge waste of space and potentially detrimental to the specimens. Maximizing the efficient use of space is always a high priority for museum collections. Storage in the trays would also leave them open to the air to collect dust, it would allow movement that could cause damage (breakage) and in the case of very small specimens or fragments, they could be blown away. I did find one of the trays was empty and learned it was a tiny specimen that was lost due to a sneeze. Additionally, I discovered specimens, which were broken or fragmented due to this storage method.
My first task was to organize the collection, arranging it in numerical order by specimen number. I then had to transfer the specimens into their new space-saving storage units. As part of this, I had to be sure to include all of the useful pieces of the damaged specimens and keep the specimens associated with their labels. The smaller specimens were rehoused in PCR tubes (plastic tubes with snap caps used in the field of molecular biology) with ethofoam plugs at the bottom to minimize the “rattle space,” a term coined by David Zelagin (Digitization Assistant at CU Boulder Natural History Museum). The PCR tubes would not only prevent further damage but also take up less space than the open trays.
After labeling, they were stored upright in museum trays using the cardboard separator inserts that come as part of the packaging for the glass vials. The larger specimens were placed in small friction lid plastic specimen boxes, with archival tissue paper at the bottom to minimize rattle space and storage space. I was able to complete reorganizing of the entire
collection and rehousing all of the small and many of the larger specimens for ease of storage.
Though not the largest fossil insect collection, UCMP’s Cenozoic insects have contributed to the Fossil Insect Collaborative TCN by filling in geographic and temporal gaps not covered by the other TCN collections. I have enjoyed the opportunity to be part of the larger effort to organize and digitize this important collection so it can be accessed in an online database and more effectively used by researchers as well as the public.
Julia Anderson’s URAP experience: Curating the AERA Energy collection – butvar, hot glue, fluffy stuff and “ethocradles”!
When I first entered the UCMP Paleontology Preparation Lab, where I would be working, a cold rush of air and the smell of dirt greeted me. This may sound unpleasant, but for me, as a future paleontologist, this rattled my heart strings! I couldn’t wait to get started on my Undergraduate Research Apprenticeship with Diane Erwin, working on the Fossil Insect PEN Project.
As Diane and I hauled metal drawers and wooden trays full of specimens into the prep lab, I took glances at what I would be working with. These specimens, which I would be curating this semester, that is preparing, cataloging, labeling and housing them for future study and imaging, looked like hunks of dirt. However, when I shined a flashlight onto the shiny soil, suddenly the wings of dragonflies and the delicate veins of an oak leaf showed themselves to me, emerging from the thousands of years-old sediment.
These fossils were collected from a Holocene oil seep site in Oil Canyon located on land owned by the AERA Energy oil company near Coalinga, California. The oily sandy rock matrix was incredibly friable, breaking apart in my hands. Something had to be done to consolidate the specimens in order for them not to turn into piles of sand in the collections!
However, before I could start my work in the prep lab, I had to take a series of online safety trainings – the Environmental Health and Safety (EH&S) 101 laboratory safety fundamentals course, the Hazardous Waste Program, the Hazardous Materials Spill Response, and the Laboratory Hazards Assessment Tool followed by an in-lab safety orientation. This certification ensured that I would not only be lab safety savvy but soon the proud owner of two fitted blue flame resistant university-issued lab coats, a pair of safety glasses and goggles. Sporting my new PPE (personal protective equipment), I set my music playing in the background and began preparing the out-of-the-field fossils. I used a very thin liquid adhesive made from a mixture of powdered polyvinyl butyral resin (Butvar®) and ethyl alcohol, a standard consolidant used for all types of fossils. Using a disposable plastic pipette, I delicately squirted some on the insect and plant impressions, with heavier applications to the matrix surrounding each specimen to solidify the sandy matrix. Sometimes I would apply the adhesive three or four times to fully stabilize the fossil.
Our quest for the perfect “cradle” for these specimens went through five stages. The first four featured a lot of masking tape and looked…well… let’s just say “interesting.” Finally, using Diane’s extraordinary origami skills and my ridiculously long time experience with a hot glue gun, we fashioned the “ethocradle,” the perfect hybrid of our previous designs. Throughout the next couple of months, I hand measured, cut out, and hot glued ethocradles for the fossils that needed them.
Then came the cataloging. I spent about two weeks meticulously going through each specimen and updating the UCMP Excel spreadsheet bulk upload form with new information. I learned a lot about insect and plant taxonomy, which was more than rewarding. The collection’s insect orders included Coleoptera (beetles), Orthoptera (grasshoppers), Odonata (dragonflies and damselflies), and Lepidoptera (butterflies and moths). The insects were beautifully preserved and I often had to take moments to admire them. As far as plants, I identified two classes; Magnoliopsida (including oak) and Liliopsida. A vast majority of the plant material was oak. To access the AERA specimen records go to the UCMP online database select Collection equals: Invertebrates and Loc ID Num field equals PA1340.
Once the official new labels were printed out it was time to celebrate! I gathered the two hundred or so field tags into my hands and threw them into the air above my head. My apprenticeship was a success! I learned so much this past semester about how fossils are prepped and housed in the UCMP’s vast collections. I achieved my goals of gaining experience working with fossils, while also having so much fun! This undergraduate research apprenticeship experience only solidified my desire to become a paleontologist and make my passion my career.
To learn more about the AERA Oil Canyon site and its significance here is a recent publication in the 2017 Desert Symposium proceedings volume entitled, “Flora and fauna of the Holocene Oil Canyon oil-sands from the poorly understood San Joaquin Desert Biozone,” pgs. 308-314, by Ryan O’Dell (BLM), UCMP staff and associates Diane M. Erwin, Patricia Holroyd, Brian Rankin, and Marwa El-Faramawi.
Asma Ahmed’s URAP experience: Assessing the UCMP Amber Type specimen collection!
I have been working the last two semesters in the UC Berkeley Museum of Paleontology on assessing the condition of the Type amber collection as part of my project for the Undergraduate Research Apprentice Program. This collection was amassed and actively published on during the 1950s to early 1970s by UC Berkeley faculty, their students and colleagues from around the world.
Together with PI Dr. Diane Erwin, I devised a system for characterizing the condition of this collection. The substandard storage of the amber specimens did not fully come to light until the digitization work started. As we discovered, the amber specimens were stored in 1 X 3 inch cardboard slide mounts sealed with a thin plastic cover slip.
Back in the day, the cardboard slides were thought to be an adequate storage method. However, in many cases the cardboard has yellowed, indicating they are not acid free, and the cover slips were placed (forced in many cases) over specimens that were taller than the slide well. I noticed that a lot of the amber damage was centered on the fracturing that resulted from being constrained in the slides from the cover slips pressing down on the amber itself. Since the amber is very fragile, any pressure can result in multiple fractures, and the closer those fractures were to the inclusions, the less likely one can actually see the insect clearly.
Furthermore, amber pieces showed scratches on their surfaces that, in part, were likely caused by the drag of the cover slip over the specimen (and the specimen against the well bottom) when the cover slips were pulled out. Some specimens were placed in double-thick cardboard slides and these fared better because the cover slips were less likely to be pushing down on the amber.
As part of my workflow, I removed the specimens, examined them with the microscope to assess their condition, recorded my findings in an excel spreadsheet, and then transferred the specimens into ethafoam-lined, light and airtight labeled plastic gem boxes to avoid further damage. To remove the amber specimens I used a scalpel to cut one side of the cardboard so that the cover slip could be removed by lifting it up rather than sliding it out.
This way, there was no further detrimental contact between the cover slip and the specimen. There are instances where handling the amber can result in more crumbling, so all the amber must be handled very carefully when taken out of and/or placed back into housing. In handling the amber it is best to use soft forceps, which minimize stress when you squeeze them because they give in response to pressure and don’t do any damage to the amber. There are even instances where placing the amber in the new box can be damaging, so the ethafoam padding needs to be cut so that it holds the amber securely, but also so that the amber isn’t so secure it is being squeezed. In order to make sure that is the case, I would hold the amber over the ethafoam and cut a hole that is slightly larger than the amber itself. That way, the amber will stay within the hole, but also has some wiggle room that avoids any stress to the amber.
Although amber darkness did impact the quality of the images, I found that in many cases it did not affect visualization of the insect unless it was coupled with extensive fracturing. Otherwise, it only blurred the image of the fossil, but didn’t make it impossible to see details. The amber specimens embedded in resin or in resin and mounted on glass microscope slides were in excellent condition: there was nothing to distract you from the fossil and you could pinpoint the location of the insect almost immediately. Fossils with internal fracturing often made shapes that look like it could be an insect, so you could mistake those patterns as an insect. Oxidized amber is generally more fragile, and therefore more likely to get fractured. All the amber has been placed in these airtight boxes and cushioned by ethafoam so that they do not move around in the boxes and undergo further damage.
I also noticed amber that was originally housed in the airtight gem boxes were generally in better condition than the ones that were in the cardboard slides. They were generally lighter-colored and didn’t feel that fragile when being handled by the soft forceps. This is probably due to the fact that when they are placed in airtight places, exposure to air is minimized.
I assessed the amber specimens by examining their relative amount of fracturing and translucence. Amber specimens were assessed through the F-factor, a score from 1-10 that assesses how much of the amber is covered in fractures, and clarity, which is also scored on a scale from 1-10 based on how clear the amber is. There were situations where there is a lot of fracturing and/or the amber is very dark, but the area around the fossil is clear. In these cases, I made a note in the specimen comments section that the fossil is visible.
There were some cases where the amber specimens were given a high score for clarity (meaning it is completely dark), but the insect itself can be seen clearly. In those cases, the darkness of the amber provided the sharp contrast needed in order to see the insect itself. In the cases where the amber is very dark, it is generally too hard to see the insect at first. However, once you have a dim light shining beneath the amber, which makes the amber itself a lighter color, and no lights shining on top (because the result is a mirror effect where you can’t see anything but the glare of the light) the insect-which is very dark-becomes a stark contrast to the dark red of the amber. This allows for the clear visualization of the insect fossil, which would not have been visible beforehand.
In general, the damage done to the amber has more to do with its F-factor than with clarity. So when calculating the percentage of amber that is damaged, the highly damaged ones are given an F-factor score of 5 or higher, whereas the less damaged ones are given a score of 4. At the time this blog was written, I had assessed 175 amber specimens. Of those fossils, 53 were highly damaged (30.3%) and 27 were moderately damaged (15.4%). My results show that among this sample 80 specimens will be given the highest priority for embedding in resin (45.7%). Embedding the fractured amber in resin will seal the cracks making the amber strong enough to withstand normal handling. The resin will also seal the amber from future oxidation, enhance the photographic quality and their detailed study with the microscope.
Meschelle Thatcher’s UCMP undergraduate research experience: Beetles in Brea!
As an English major, I didn’t really know what to expect when I first started my URAP (Undergraduate Research Apprenticeship Program) appointment for the UC Museum of Paleontology Fossil Insect PEN (Partner to an Existing Network) funded by the National Science Foundation. All I knew was that I’d be handling fossils, and that struck the scientific chord in my imagination in perfect harmony.
The Pleistocene Rancho La Brea tar pits in southern California are best known for their extinct exotic animals. However, I’ve learned there is more life in these asphalt seeps than saber-toothed cats, dire wolves, sloths, mastodons and camels. As part of my URAP experience I’ve been sorting the remains of beetles from the asphalt seeps at Rancho La Brea in Los Angeles and those near McKittrick, CA, in the southern San Joaquin Valley. Again, coming from a Humanities-oriented framework, I was slightly overwhelmed when my supervisor, Senior Museum Scientist, Diane Erwin, told me to pull out all the beetles I could find from bulk samples of asphalt recently discovered in the collection that had not yet been catalogued. Surely I was capable of spotting beetles, but I found myself wondering if I should also put aside things that look like legs, fragments of elytra and other beetle body parts? What if these beetle remnants should somehow alter the course of science forever? Ultimately, I found out that these anatomical fragments were indeed cute, but it wasn’t necessary to catalog them as individual specimens. Although not deserving of their own photo shoot, I learned they would be gathered for a group photo.
Fast forward to this lovely week in April, and I now have plenty of whole beetles really worth looking over. While most of them were easy to spot with the naked eye, I sometimes had to use a 10x magnifying glass to find the really small ones mixed in with the asphalt—the struggle with which I am positive any real paleontologist will identify. Undoubtedly, analyzing these fossils via zoomed in images of them will be particularly helpful. After all, the naked eye can only see so much. And when some of the beetle remains are just a few millimeters in size, we wholeheartedly welcome technology to swoop in and save the day…so long as we get the credit for our discoveries.
I have also helped with the imaging of the UCMP type specimens from Rancho La Brea and uploaded several dozen photos of the McKittrick beetles in the effort to digitize the diverse fossil insect collection at UCMP. By doing so, researchers, teachers, students, as well as citizen scientists and interested public all over the world will literally have accessible data at their fingertips to study. The Rancho La Brea type specimens, described and illustrated over 100 years ago, are a wonderful example of how the digitization age is allowing us to see these old collections in a new light.
As I move forward in life, such experiences will continue for me as a lifelong learner with interdisciplinary interests.
Hiep Nguyen’s UCMP undergraduate research experience: “Scentless in Nevada”
I have been working this past year on making ‘sense” out of a fossil “scentless” plant bug from the middle Miocene Stewart Valley locality in west-central Nevada. Together with Senior Museum Scientist Diane M. Erwin we have identified a new fossil species of scentless plant bug (family Rhopalidae) from a Miocene lake bed deposit in Stewart Valley, Nevada. The study developed as a result of my participation as an Undergraduate Research Apprentice (URAP) in UC Berkeley’s fossil insect digitization PEN project (BFIP) funded by the National Science Foundation. The BFIP project is part of the Fossil Insect Collaborative Thematic Collections Network, a group of seven institutions that house our nation’s largest fossil insect collections. Their charge is to database and image these collections for public access online through the iDigBio and iDigPaleo web portals.
The Stewart Valley rhopalid is brown-bodied, 6.5-7.5 mm long from head to the tip of the abdomen, has numerous dark spots covering the legs, and the femur of its two back legs is noticeably wider than the others, but shows no evidence of spines. The feature that stands out most however is the striking set of dorsal markings on the insect’s abdomen. In the pictures below, you will notice a figure-8 shaped crest accompanied by four similarly-sized semicircular spots beneath it.
Diane and I worked through a long process of examining species sharing similar characteristics to our specimens. We collaborated with the Essig Museum of Entomology to examine modern counterparts to our fossil and were able to narrow the family down to the Rhopalidae. We then consulted the published literature on rhopalids and used the combination of abdominal markings and other characters to differentiate between species within Rhopalidae. What we found was that the fossil shares a number of its characters with species in several genera, but is closest to those in the subfamily Rhopalinae, tribe Rhopalini. Of especial note is the fossil’s abdominal markings, which are very reminiscent of those on the purported introduced European species, Brachycarenus tigrinus.
I wrapped up my URAP with a poster presentation for the 2016 Geological Society of America meeting held in Denver, CO detailing our findings about this newly discovered fossil insect and its evolutionary, biogeographic and paleoenvironmental implications as well as a first draft of a paper to be published on these results. The Nevada landscape of today with its miles of treeless expanse, dry lakebeds (playas), hot summers and cold winters was quite the opposite during the Miocene. Unlike today, Stewart Valley boasted an abundance of rain. A lush forest of dicotyledonous trees and nearby grasslands sporting an array of herbaceous plants surrounded a large lake teeming with aquatic life, its waters sustaining a diverse vertebrate fauna. Indeed 14.5 million years ago the Stewart Valley was an ideal habitat for scentless plant bugs to thrive and diversify.