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Peter Buck Deep Time Postdoctoral Fellow '24-present
Smithsonian National Museum of Natural History

Assistant Professor, starting '25

University of Maryland Department of Geology

Geobiologist | Artist | Science Communicator

Cecilia B. Sanders

  • Morton K. Blaustein Postdoctoral Fellow '22-'24 (Johns Hopkins University)

  • PhD '22 in Geobiology (Caltech)

  • MS '18 in Planetary Science (Caltech)

  • BA '16 in Earth and Planetary Sciences and Astrophysics (Harvard University)



Currently, I am a postdoctoral fellow in the Departments of Paleobiology and Mineral Sciences at The Smithsonian National Museum of Natural History. My postdoctoral research builds upon my doctoral thesis work in sedimentology/stratigraphy, micropaleontology, and geochemical analysis, investigating the role of paleoenvironment, paleoecology, and diagenesis in the creation of phosphate-rich sedimentary deposits across geologic time. The particular deposits I am studying include the Ediacaran-aged Salitre and Bambuí formations in Eastern Brazil, and the Ediacaran and lower Cambrian successions of Western Mongolia and Southern Kazakhstan.

My research is ultimately motivated by my avid interest in the origins and evolution of life in the universe. How did life begin, and what was it like throughout deep time? In order to answer such questions, we must understand how our record of ancient life is formed. For me, this means studying the preservation potential for biosignatures of organisms with different metabolic strategies and environmental niches. I do this by looking at the geologic record and prying later, diagenetic features apart from structures related to the primary depositional environment: the world in which the rock was formed. And sometimes, by studying the behavior of modern microorganisms under conditions analogous to ancient environments.

Teaching and Outreach


If you are interested in having me or my colleagues speak at your school, institution, or event, please feel free to reach out!

Geological and planetary studies are an excellent access point to the natural sciences, because the subject matter is everywhere: rocks, sky, water, life. I use this principle in my education and outreach work: observe, document, and experiment with your immediate surroundings (things you can touch and experience directly), and more abstract and fantastic concepts will follow.

In addition to working as a teaching assistant during my graduate studies at Caltech, I also:

  • Design and implement hands-on science lesson plans for elementary school students in the Pasadena Unified School District through Caltech's Center for Teaching, Learning, and Outreach (weekly or biweekly Visiting Scientists Program, collaboration with PUSD teachers and administrators)

  • Give lectures on Earth and space sciences locally (schools, museums, community science exploration events) and remotely/online

  • Mentor undergraduate and Master's students through their graduate school and fellowship applications



As long as I can remember, I have loved storytelling: the process of creating a world and populating it with fantastic characters. As a child,  I made paper dolls, assembled small fairies out of florists' wire and fabric, and wrote about and illustrated the lands they inhabited. Today, in my professional work with landscapes, microscopic fossils, and sedimentary structures, I apply that childhood's love in new ways. I go to the field, I observe and measure, I create graphite-and-ink drawings and digital renderings of my subjects, and I collect samples. I use these data to build a picture of an ancient and faraway world: Precambrian Earth, Noachian Mars, shallow seas, deep caves, etc. Outside of the artwork and graphic design I produce for my research, I also draw and paint fictional landscapes, maps, characters, and creatures, and write stories about them.


& Articles

This blog is under construction. Check back later if you're ever interested in my essays, poetry, artwork, and field journaling.

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