{
  "sample_count": 0,
  "documented_genus_count": 1,
  "articulation_known_records": 2,
  "articulation_proportions_known": {
    "fully_articulated": 1.0
  },
  "sample_densities": [],
  "preservation_proportions_known": {
    "complete": 1.0
  },
  "record_count": 7,
  "specimen_count_sum": 7,
  "counts_by_unit": {
    "specimens": 7
  },
  "preservation_known_records": 2,
  "records_with_associations": 0,
  "mean_size_mm": null,
  "note_counts_vs_records": "record_count counts documented occurrence records; specimen_count_sum sums only counts recorded in specimens. Fragments and pieces are separate units, never added to specimens.",
  "by_formation": {
    "Arnheim Formation": {
      "records": 7,
      "specimens": 7
    }
  },
  "by_locality": {
    "Flat Run Quarry": {
      "records": 7,
      "specimens": 7
    }
  },
  "by_layer": {
    "0": {
      "records": 7,
      "specimens": 7
    }
  },
  "by_group": {
    "trilobite": {
      "records": 7,
      "specimens": 7
    }
  },
  "by_genus": {
    "Flexicalymene": {
      "records": 7,
      "specimens": 7
    }
  },
  "by_preservation": {
    "complete": {
      "records": 2,
      "specimens": 2
    },
    "unknown": {
      "records": 5,
      "specimens": 5
    }
  },
  "by_disposition": {
    "collected": {
      "records": 7,
      "specimens": 7
    }
  },
  "by_year": {
    "2026": {
      "records": 7,
      "specimens": 7
    }
  },
  "known_size_measurements": 0,
  "size_note": "measured subset only; sizes are reported where recorded, never estimated for unmeasured finds",
  "association_frequency": {},
  "rare_documented": [
    {
      "genus": "Flexicalymene",
      "records": 7,
      "meaning": "infrequently documented in this dataset \u2014 NOT a statement about geological rarity"
    }
  ],
  "method_bias_note": "These are counts of documented field observations, not a standardized survey of fossil abundance. Sampling effort, weather, exposure and collector focus all bias the counts."
}