RESEARCH BASE
Search 3,721 documents across 34 fields — every claim tier-rated by evidence
3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.
24 results for "stratigraphic marker" — page 1 of 2
ZB_5_19 — The Anthropocene: Human Dominance of Earth Systems and Epoch Dating
The Anthropocene — a proposed geological epoch defined by the dominant influence of human activity on Earth's geology, climate, and ecosystems — has become one of the most consequential and contentious concepts in modern
ZH_3_04 — Chaco Canyon: Solar Markers and Pueblo Astronomy
Chaco Canyon (northwestern New Mexico) was the center of Ancestral Puebloan (formerly called Anasazi) civilization from approximately 850–1150 CE, featuring monumental Great Houses containing hundreds of rooms, extensive
ZH_5_08 — Solstice and Equinox Traditions: Seasonal Markers Across Cultures
The solstices (longest and shortest days) and equinoxes (equal day and night) are the four cardinal points of the solar year — astronomically defined by the Sun reaching its maximum/minimum declination (solstices) or cro
E_1_13 — Cosmic Impact Markers: Nanodiamonds, Microspherules, Platinum
Cosmic impact markers are distinctive mineralogical, geochemical, and textural features preserved in geological strata that provide evidence for extraterrestrial impact events — including asteroid/comet impacts and airbu
Z_2_21 — Epigenetic Aging Clocks
Epigenetic aging clocks are mathematical models that use patterns of DNA methylation at specific CpG dinucleotides across the genome to estimate an individual's biological age with remarkable accuracy — typically within
L_5_05 — Epigenetic Clocks: Measuring Biological Age
Epigenetic clocks are mathematical models that estimate biological age — the physiological age of an organism's cells and tissues — based on DNA methylation patterns at specific CpG sites (regions where a cytosine nucleo
X_5_30 — Heart Rate Variability: Autonomic Function, Stress, and Integrative Health
Heart rate variability (HRV) — the variation in time intervals between consecutive heartbeats — is a non-invasive biomarker of autonomic nervous system (ANS) function that has emerged as one of the most widely studied ph
X_4_01 — Personalized and Genomic Medicine
Personalized medicine (also called precision medicine) represents the shift from one-size-fits-all treatment to therapies tailored to an individual's genetic profile, biomarkers, and molecular disease characteristics. Th
ZH_4_09 — Astronomical Petroglyphs and Rock Art
Humans have carved, painted, and pecked celestial imagery into rock surfaces for at least 10,000 years — and possibly far longer. Astronomical petroglyphs and pictographs are found on every inhabited continent: images of
ZF_3_10 — Marine Paleontology and the Fossil Record of the Seas
Marine paleontology documents the evolution of life in Earth's oceans over ~3.8 billion years — from the earliest microbial fossils (stromatolites, ~3.5 Ga) to the complex marine ecosystems of the modern ocean. The marin
Z_5_20 — Proteomics: The Complete Protein Landscape of Life
Proteomics — the large-scale study of the complete protein complement (proteome) of a cell, tissue, or organism — emerged in the 1990s as the necessary counterpart to genomics. While the human genome contains ~20,000 pro
Z_5_03 — Metabolomics: The Small-Molecule Landscape of Life
Metabolomics — the comprehensive study of all small-molecule metabolites (<~1,500 Da) present in a biological sample (cell, tissue, organ, biofluid, organism) — is the newest of the major "-omics" disciplines (after geno
Z_2_18 — Pharmacogenomics and Precision Medicine
Pharmacogenomics — the study of how genetic variation affects individual responses to drugs — aims to replace the "one-size-fits-all" prescribing model with genotype-guided therapy, selecting the right drug at the right
K_3_09 — Minimal Consciousness and the Threshold of Sentience
Where does consciousness begin? This question — the problem of the threshold of sentience — is one of the most challenging in consciousness studies because it requires identifying what KIND of physical system is minimall
K_5_12 — Interoception: Body Signals and Conscious Experience
Interoception — the perception of the internal physiological state of the body — encompasses the sensing and central processing of signals from the heart (cardiac rhythm, blood pressure), lungs (breathing), gut (satiety,
E_3_18 — Black Mat: Younger Dryas Boundary Layer Geochemistry
The "black mat" is a thin, dark, organic-rich sedimentary layer found at dozens of archaeological and geological sites across North America, dating to the onset of the Younger Dryas stadial (~12,800 cal BP). First system
E_4_18 — Tephra Chronology: Volcanic Ash as Geological Clock
Tephrochronology is the use of volcanic tephra layers (ash, pumice, and other pyroclastic deposits) as time markers (isochrons) for dating and correlating geological, paleoenvironmental, and archaeological sequences acro
ZG_2_14 — Historical Pragmatics: Speech Acts and Politeness Across Centuries
Historical pragmatics investigates how language use in context — speech acts, politeness strategies, discourse organization, implicature, and interpersonal meaning — has changed over time. Where historical linguistics tr
G_2_03 — Bayesian Reasoning and Archaeological Inference
Bayesian reasoning — the systematic updating of probabilities for hypotheses as new evidence is acquired — has transformed archaeology, chronology, and the evaluation of disputed historical claims since the 1990s. At its
T_1_07 — Emotion Theory and Affect
Emotion theory addresses one of psychology's most fundamental and contested questions: What are emotions, where do they come from, and how many are there?
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