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Layers holdtales of time

Every layer of sediment records a chapter of our planet, from ancient seabeds to drifting ash, layered across millions of years beneath us.

Our interactive maps let you peel back the crust to trace how stones, fossils, and deep time combine to shape the ground beneath your feet.

Start Digging
ArcGIS Pro QGIS Brunton Compass Rock Hammer Hand Lens XRD Leapfrog Geo Munsell Chart GPS Total Station Jacob's Staff ArcGIS Pro QGIS Brunton Compass Rock Hammer Hand Lens XRD Leapfrog Geo Munsell Chart GPS Total Station Jacob's Staff
01About

Reading the rock's long memory.

Focus areas

  • Structural geology & field mapping
  • Sedimentary petrology & stratigraphy
  • GIS & remote sensing (ArcGIS / QGIS)
  • Hydrogeology fundamentals

I'm a geology student who reads landscapes the way other people read paragraphs. Every outcrop is a sentence, every layer a clause, and my job in the field is to figure out what the rock is trying to say.

The rock doesn't lie — you just have to learn to read it. I'd rather spend an extra hour at the outcrop confirming a contact than build a model on a guess.

Flagstaff, AZNorthern Arizona UniversityOpen to field assistant & research roles
02Field Method

Four steps. Every outcrop.

01

Observe

Describe the outcrop — lithology, bedding, contacts, structure — before touching a single sample.

02

Sample

Collect oriented specimens, log GPS coordinates, and photograph context for every station.

03

Analyze

Thin-section petrography, hand-lens mineral ID, and lab work back at the bench.

04

Interpret

Build the stratigraphic column and structural model the data actually supports.

03Formations

Every sample finds its layer.

Keep scrolling — four field samples settle into the stratigraphic order I logged them in, formation by formation.

SandstoneSupai Group
LimestoneKaibab Fm.
ShaleHermit Fm.
Basalt BedrockSF Volcanic Field
ALIGNED0%
04Field Research

Studies that earned a footnote.

Tilt a card — every study here started with a field notebook before it ever reached a map.

No. 01Structural Geology · Field Mapping

Mapping the Sedona Fault Scarp

Produced a 1:12,000 field map of a normal fault scarp cutting Permian redbeds north of Sedona, AZ.

Brunton CompassArcGIS ProJacob's Staff
  • 38 strike-and-dip stations logged
  • Fault offset estimated at 14m
  • Presented at NAU undergrad symposium
No. 02Petrology · Thin-Section Microscopy

Petrographic Analysis of Kaibab Limestone

Characterized diagenetic textures in Kaibab Formation limestone using 40 thin sections under polarized light.

Petrographic MicroscopeImageJXRD
  • Identified 3 distinct diagenetic phases
  • Built a point-count porosity dataset
  • Co-authored department poster
No. 03GIS · Hazard Mapping

GIS Landslide Susceptibility Model

Built a weighted-overlay landslide susceptibility model for Oak Creek Canyon from slope, lithology, and rainfall layers.

ArcGIS ProQGISPython (rasterio)
  • 92% slide-inventory overlap with high-risk zones
  • Model adopted for a class capstone
  • Open dataset published on GitHub
No. 04Stratigraphy · Core Logging

Stratigraphic Column of the Supai Group

Logged and correlated a 240m composite section of the Supai Group across three canyon-wall exposures.

Jacob's StaffMunsell ChartLeapfrog Geo
  • Correlated 6 marker beds across sections
  • Built a 3D stratigraphic model
  • Flagged a new unconformity candidate
No. 05Hydrogeology · Field Sampling

Groundwater Recharge Study, Verde Valley

Sampled monitoring wells across the Verde Valley aquifer to estimate seasonal recharge from isotope tracers.

YSI Multiparameter ProbeStable Isotope AnalysisExcel/R
  • Sampled 11 wells across 2 seasons
  • Estimated 6% annual recharge rate
  • Data shared with local watershed council
No. 06Volcanology · Tephrochronology

Volcanic Ash Layer Correlation

Correlated tephra layers from the San Francisco Volcanic Field across four outcrops using grain geochemistry.

Hand LensSEM-EDSArcGIS Pro
  • Matched 2 ash beds to known eruptive events
  • Refined local tephra chronology
  • Field season funded by department grant
06Skills

Plotted like a strike-and-dip rose.

Field & Lab

  • Outcrop Mapping90%
  • Hand-Lens Mineral ID88%
  • Thin-Section Petrography80%
  • Core Logging78%

Technical & GIS

  • ArcGIS Pro / QGIS92%
  • Leapfrog Geo70%
  • Python (geospatial)68%
  • AutoCAD Cross-Sections65%
07Experience

Two field seasons in.

Field Assistant · USGS Flagstaff Science Center

Summer 2025

Assisted senior geologists with outcrop description, sample collection, and GPS station logging across the Colorado Plateau.

Field MappingSample PrepData Logging

Undergraduate Research Assistant · NAU Department of Geology

2024 — Present

Supporting a faculty-led stratigraphy project — thin-section prep, point-counting, and GIS layer management.

PetrographyArcGIS ProLab Methods

Teaching Assistant · Intro to Mineralogy Lab, NAU

2023 — 2024

Ran weekly lab sections on mineral identification, crystal systems, and hand-lens technique for 60+ students.

Mineral IDInstructionLab Safety
08Credentials

Papers to back the field notes.

Summer Field Geology Camp

Northern Arizona University

2025

Wilderness First Aid

NOLS

2024

OSHA HAZWOPER 24-Hour

OSHA

2024

ArcGIS Pro Certified User

Esri

2023

09From The Field

What advisors say.

Mara's fault map was the most carefully stationed undergraduate field work I've reviewed in a decade — every contact justified, nothing guessed.
Dr. Elena ParkResearch Advisor, NAU Department of Geology
She was the student who went back up the canyon wall a second time just to double-check a bedding measurement. That instinct is what separates field geologists.
Tom IversonField Camp Instructor
Mara logged cleaner station data than some of our seasonal hires. I'd take her back on the crew without hesitation.
Priya NathanGeologist, USGS Flagstaff Science Center
10Get In Touch

Got an outcrop worth mapping?

Field assistant roles, research collaborations, or a section that needs a second pair of eyes — send the brief.

© 2026 Mara VossFlagstaff, AZ