| 1. Domain | 1.1 Scope of the Domain | Boundaries | The range of phenomena the science includes and excludes. | Studies the transport, deposition, diagenesis, and lithification of sediments and the interpretation of layered sedimentary successions; includes facies analysis, depositional environments, basin evolution, and temporal stratigraphic relationships. Excludes igneous/metamorphic processes unless influencing sedimentation. |
| | Scale | The spatial, temporal, or organizational level at which the science operates (e.g., quantum, cellular, social, cosmic). | Operates from grain-scale physics → bedforms → outcrop-scale stratification → basin-scale architectures → regional to global stratigraphic correlation; spans micron–grain scale to hundreds of kilometers. |
| 1.2 Ontological Commitments | Entities | The kinds of things assumed to exist within the domain (particles, organisms, agents, fields, etc.). | Sediment grains, particles, clasts, matrix, cement, fossils, sedimentary structures, beds, facies, stratigraphic units, sequences, unconformities, accommodation space, fluid flows, depositional systems. |
| | Properties | The fundamental attributes these entities possess (mass, charge, genotype, preference, etc.). | Grain size, sorting, roundness, porosity, permeability, composition, cohesion, bed thickness, lamination, sediment flux, flow velocity, facies attributes, accommodation, subsidence rate, sedimentation rate. |
| | Categories | The basic ontological types used to classify domain elements (substances, processes, relations, structures). | Sediment types (clastic, chemical, biogenic), depositional environments (fluvial, deltaic, marine, aeolian, glacial), sedimentary structures (ripples, dunes, cross-bedding, graded bedding), stratigraphic units (formations, members), sequence types (transgressive, regressive). |
| 1.3 State-Variables | Variables | The measurable or definable properties that describe system conditions. | Flow velocity, shear stress, sediment load, grain-size distribution, water depth, accommodation space, subsidence rate, sedimentation rate, sea-level position, chemical saturation state, bioturbation intensity. |
| | Parameterization | How variables encode and represent the system’s state. | States encoded via grain-size curves, hydraulic parameters, transport equations, stratigraphic thickness, facies proportions, sequence boundaries, sea-level curves, isotopic signatures, chemostratigraphy, magnetostratigraphy. |
| 1.4 Admissible Idealizations | Simplifications | Conceptual reductions used to make the domain tractable (point masses, rational agents, perfect gases). | Treating flows as steady/uniform, ignoring biological modification, assuming constant sea level, uniform sediment supply, planar bedding, constant grain density, perfect sorting, linear accommodation changes. |
| | Validity Conditions | The limits and contexts in which idealizations hold or break down. | Valid for idealized environments or first-order models; breaks down in rapidly changing systems, storm-dominated shelves, tectonically active basins, mixed siliciclastic-carbonate settings, intense bioturbation, or highly variable flows. |
| 1.5 Domain Assumptions | Structural Assumptions | Background ontological stances such as determinism, continuity, randomness, discreteness. | Sedimentary structures encode flow conditions; facies reflect depositional environments; stratigraphic sequences reflect sea-level and accommodation changes; superposition principles hold; sediment supply and accommodation govern basin fill. |
| | Implicit Commitments | Unstated but necessary assumptions that shape the field’s conceptual structure. | Assumes persistent physical laws of fluid flow, recognizable facies patterns, mappable stratigraphic relationships, interpretable interactions of sediment supply and accommodation, and preservable depositional signatures. |
| 1.6 Internal Coherence Requirements | Consistency | The demand that domain concepts do not contradict one another. | Requires agreement among sedimentary structures, facies assemblages, stratigraphic architecture, basin evolution models, physical transport laws, and geochronology. |
| | Compatibility | The requirement that entities, variables, and assumptions fit together into a unified descriptive framework. | Demands alignment between sedimentology, stratigraphy, geomorphology, basin analysis, paleontology, geochemistry, and tectonics within a unified depositional–stratigraphic framework. |
| 2. Evidence Layer | 2.1 Observable Phenomena | Observables | The aspects of the domain that can produce detectable signals accessible to measurement. | Grain size/sorting, sedimentary structures (ripples, dunes, cross-bedding, mudcracks), bedding thickness, facies transitions, bioturbation textures, color changes, fossil assemblages, unconformities, stratigraphic stacking patterns, chemical laminations, graded beds. |
| | Detection Limits | The boundaries of what can be resolved or sensed by current instruments or methods. | Limited by grain-size resolution, weathering/alteration, poor exposure, core recovery quality, seismic vertical resolution, bioturbation intensity, facies overprinting, sampling spacing, and limitations in imaging subsurface continuity. |
| 2.2 Measurement Systems | Units | Standardized quantifications (meters, seconds, volts, decibels, dollars, etc.) necessary for consistent comparison. | Grain size (µm–mm), bed thickness (cm–m), flow velocity proxies, porosity (%), permeability (mD–D), sedimentation rate (mm/yr to m/kyr), stratigraphic thickness (m), seismic time/depth, fossil/assemblage abundance counts, isotopic ratios. |
| | Instruments | Devices and tools (microscopes, spectrometers, sensors, surveys, detectors) used to produce measurements. | Sieves, laser particle sizers, petrographic microscopes, SEM, core scanners, gamma-ray logs, seismic-reflection systems, drones/LiDAR, ground-penetrating radar (GPR), XRD/XRF, isotope-ratio mass spectrometers, CT core scanners. |
| 2.3 Operational Definitions | Definitions | Terms defined by specific measurement procedures, ensuring empirical clarity. | Facies defined by grain size + structures + composition; bedding defined by visual/physical breaks; formation/member boundaries defined by mappable changes; accommodation defined by available space for deposition; sedimentation rate defined by thickness/time or age dating. |
| | Procedures | The explicit steps required to perform a measurement in a reproducible way. | Grain-size analysis, thin-section preparation, core logging, stratigraphic column measurement, seismic interpretation, facies mapping, fossil identification, isotopic sampling, sedimentary-structure measurement routines. |
| 2.4 Data Acquisition | Protocols | Formal processes for gathering data under controlled or standardized conditions. | Systematic section logging, vertical section measurement, continuous core scanning, sieve/laser analyses, seismic-section acquisition, stratigraphic correlation across wells/outcrops, repeated sampling through vertical successions. |
| | Sampling | Rules determining which subset of the domain is measured and how representative it is. | Multiple beds, representative facies, cross-sectional transects, vertical and lateral sampling, multi-core sampling, fossil assemblage sampling, repeated grain-size replicates, high/low-energy environment sampling. |
| 2.5 Data Character & Format | Data Types | The form raw evidence takes (time series, spectra, images, counts, qualitative records). | Stratigraphic columns, facies logs, seismic profiles, core images, grain-size histograms, bedding measurements, geochemical/isotopic profiles, fossil abundance tables, photomosaics, paleoenvironmental reconstructions. |
| | Resolution | The granularity or precision with which data is captured. | Determined by sampling interval, sieve/laser resolution, seismic bandwidth, GPR frequency, core quality, imaging resolution, age-dating precision, and ability to resolve thin or rapidly changing beds. |
| 2.6 Reliability & Calibration | Calibration | Adjustment procedures ensuring instruments produce accurate results. | Sieve calibration, laser-sizing calibration, seismic velocity models, gamma-ray tool calibration, microscope alignment, isotopic standardization, GPR antenna calibration, CT-density calibration. |
| | Error Characterization | Identification and quantification of noise, uncertainty, bias, and measurement error. | Grain-size measurement errors, misidentified structures, seismic noise, correlation uncertainty, sampling gaps, diagenetic overprinting, fossil reworking, tool drift in well logs, outcrop misinterpretation, lateral facies variability. |
| 3. Structural Layer | 3.1 Patterns & Regularities | Laws / Relations | Stable, repeatable patterns governing how observables behave across conditions. | Flow velocity controls grain-size transport; sedimentation follows settling-velocity laws; Walther’s Law links vertical facies to horizontal environments; accommodation–sediment supply balance determines stratigraphic stacking; graded bedding forms from waning flow; cross-bedding records flow direction. |
| | Invariants | Quantities or properties that remain constant under transformations (symmetries, conservation laws). | Repeated facies successions within similar depositional settings, characteristic bedforms for given flow regimes, stable ordering of sequence-stratigraphic surfaces, predictable sorting patterns, consistent fossil assemblages within depositional zones. |
| 3.2 Causal Architecture | Mechanisms | Underlying processes or structures that produce the observed regularities. | Sediment transport by traction/saltation/suspension; deposition when shear stress drops below critical threshold; erosion when shear stress exceeds critical threshold; diagenesis alters porosity/cementation; compaction reduces volume; accommodation changes from subsidence or sea-level variation. |
| | Pathways | Organized sequences of interactions forming a causal chain or network. | Erosion → transport → deposition → burial → diagenesis → lithification; increasing accommodation → transgression → retrogradational stacking; decreasing accommodation → regression → progradational stacking; channel migration, avulsion, delta-lobe switching. |
| 3.3 Theoretical Vocabulary | Concepts | Core terms that encode the domain’s structure (force, gene, equilibrium, field). | Grain size, sorting, bedforms, facies, accommodation, preservation potential, sequence boundary, flooding surface, systems tract, progradation, retrogradation, aggradation, maturity, sediment supply, diagenesis. |
| | Classifications | Taxonomies, categories, or typologies that organize entities and relations. | Depositional environments (fluvial, deltaic, marine, aeolian, glacial); bedform types (ripples, dunes, antidunes); facies associations; stratigraphic units (formations, members); sequence types (transgressive/regressive); lithofacies classes. |
| 3.4 Formal Representations | Equations | Mathematical constructs expressing laws, relations, or mechanisms. | Stokes’ Law (settling velocity), Hjulström diagram relations, Shields criterion (critical shear stress), sediment-flux equations, accommodation–sediment supply balance equations, compaction curves, porosity–depth exponential relations. |
| | Models | Structured representations—mathematical, computational, or conceptual—used to predict and explain phenomena. | Facies models, sequence-stratigraphic models, sediment-transport models, delta progradation models, shoreline-trajectory models, diagenesis models, forward stratigraphic modeling (e.g., Dionisos, SEDSIM). |
| 3.5 Idealized Structures | Simplified Models | Purposeful abstractions that capture essential dynamics while omitting irrelevant detail. | Steady/uniform flow, constant sediment supply, no bioturbation, perfect sorting, planar bedding, simple accommodation changes, uniform grain interactions without cohesion, no diagenetic alteration. |
| | Limit Conditions | Regimes where specific models or approximations hold (classical vs. quantum, linear vs. nonlinear). | Fail during storms or floods, variable flows, strong bioturbation, tectonic uplift/subsidence, rapid sea-level change, mixed siliciclastic–carbonate systems, intense diagenesis, heterogeneous sediment supply. |
| 3.6 Integrative Frameworks | Unifying Theories | Higher-order structures that connect disparate laws or mechanisms under a coherent whole. | Integration of fluid dynamics, sediment transport, facies analysis, sequence stratigraphy, and diagenesis to reconstruct depositional environments and basin evolution; links physical processes → facies → stratigraphic architecture → basin history. |
| | Interdisciplinary Links | Points where the theory connects to adjacent sciences or larger explanatory systems. | Intersects with geomorphology, hydrology, marine geology, paleontology, geochemistry, basin analysis, climatology, tectonics, and petroleum geology. |
| 4. Method Layer | 4.1 Inquiry Design | Experimental Design | Structured plans for manipulating variables to test causal claims. | Flow velocity controls grain-size transport; sedimentation follows settling-velocity laws; Walther’s Law links vertical facies to horizontal environments; accommodation–sediment supply balance determines stratigraphic stacking; graded bedding forms from waning flow; cross-bedding records flow direction. |
| | Observational Design | Systematic approaches for gathering non-manipulated data (surveys, field studies, natural experiments). | Repeated facies successions within similar depositional settings, characteristic bedforms for given flow regimes, stable ordering of sequence-stratigraphic surfaces, predictable sorting patterns, consistent fossil assemblages within depositional zones. |
| 4.2 Testing & Validation | Hypothesis Testing | Procedures for evaluating whether evidence supports or contradicts specific claims. | Sediment transport by traction/saltation/suspension; deposition when shear stress drops below critical threshold; erosion when shear stress exceeds critical threshold; diagenesis alters porosity/cementation; compaction reduces volume; accommodation changes from subsidence or sea-level variation. |
| | Replication | The requirement that results be independently reproducible under similar conditions. | Erosion → transport → deposition → burial → diagenesis → lithification; increasing accommodation → transgression → retrogradational stacking; decreasing accommodation → regression → progradational stacking; channel migration, avulsion, delta-lobe switching. |
| 4.3 Inference & Evaluation | Statistical Inference | Rules for drawing conclusions from noisy or incomplete data. | Grain size, sorting, bedforms, facies, accommodation, preservation potential, sequence boundary, flooding surface, systems tract, progradation, retrogradation, aggradation, maturity, sediment supply, diagenesis. |
| | Model Comparison | Criteria (fit, simplicity, predictive accuracy, robustness) used to evaluate competing models. | Depositional environments (fluvial, deltaic, marine, aeolian, glacial); bedform types (ripples, dunes, antidunes); facies associations; stratigraphic units (formations, members); sequence types (transgressive/regressive); lithofacies classes. |
| 4.4 Error Management | Error Analysis | Identification and quantification of random and systematic errors. | Stokes’ Law (settling velocity), Hjulström diagram relations, Shields criterion (critical shear stress), sediment-flux equations, accommodation–sediment supply balance equations, compaction curves, porosity–depth exponential relations. |
| | Bias Control | Methods for minimizing subjective, instrumental, or procedural biases. | Facies models, sequence-stratigraphic models, sediment-transport models, delta progradation models, shoreline-trajectory models, diagenesis models, forward stratigraphic modeling (e.g., Dionisos, SEDSIM). |
| 4.5 Adjudication & Revision | Peer Scrutiny | Collective evaluation of claims through critique, review, and debate. | Steady/uniform flow, constant sediment supply, no bioturbation, perfect sorting, planar bedding, simple accommodation changes, uniform grain interactions without cohesion, no diagenetic alteration. |
| | Theory Revision | Procedures for modifying, replacing, or discarding models based on new evidence. | Fail during storms or floods, variable flows, strong bioturbation, tectonic uplift/subsidence, rapid sea-level change, mixed siliciclastic–carbonate systems, intense diagenesis, heterogeneous sediment supply. |
| 4.6 Integrity Conditions | Transparency | Requirements to disclose methods, data, assumptions, and limitations. | Integration of fluid dynamics, sediment transport, facies analysis, sequence stratigraphy, and diagenesis to reconstruct depositional environments and basin evolution; links physical processes → facies → stratigraphic architecture → basin history. |
| | Ethical Standards | Norms ensuring responsible conduct in experimentation, data handling, and publication. | Intersects with geomorphology, hydrology, marine geology, paleontology, geochemistry, basin analysis, climatology, tectonics, and petroleum geology. |