Examkin

Question

Difficulty: MediumEarth's History and Paleontology

Paleontologists classify prehistoric biological remains according to the specific geological and chemical mechanisms that preserved them. Match each fossil preservation mode with its defining geological characteristic.

  • Trace fossilSedimentary rock records indirect physical evidence of an ancient organism's biological activity, such as footprints, burrows, or coprolites, without preserving body parts.
  • Mold and castBuried biological structures dissolve completely to leave a hollow cavity in rock, which subsequently fills with percolating minerals that replicate the external shape.
  • CarbonizationIntense compression drives off organic liquids and gases, leaving behind a thin silhouette film of pure elemental residue.
  • Amber entombmentWhole, delicate organisms are completely encased and sealed within hardened, fossilized tree resin with original soft tissues intact.

Answer

Trace fossil correctly pairs with sedimentary evidence of biological activity without body parts; Mold and cast correctly pairs with a hollow cavity filled with secondary minerals replicating external morphology; Carbonization correctly pairs with compression expelling volatiles to leave a thin carbon film; Amber entombment correctly pairs with complete organisms sealed in hardened tree resin.
Each fossilization process corresponds directly to distinct physical and geochemical mechanisms: trace fossils capture indirect activity (footprints and burrows); mold and cast formations represent hollow dissolution cavities filled by mineral crystallization; carbonization results from volatile loss under pressure leaving a thin carbonaceous film; and amber entombment seals whole specimens in fossilized resin.

Step-by-Step Solution

1
Differentiate body fossils from behavioral artifacts
Trace fossils are matched to behavioral evidence like footprints, trackways, burrows, and coprolites rather than skeletal or soft-tissue remains.
Paleontological taxonomy defines trace fossils strictly as structural manifestations of activity.
2
Distinguish between hollow impressions and secondary mineral infills
Mold and cast is matched to the two-stage process of dissolution cavity creation followed by mineral precipitation.
Molds preserve external negative space, while casts produce positive physical replicas from mineral deposits.
3
Identify chemical distillation under compaction
Carbonization is matched to the expulsion of hydrogen, nitrogen, and oxygen, leaving behind an outline of residual carbon.
Carbonization specifically preserves detailed flat outlines of leaves, fish, and arthropod exoskeletons in fine-grained shale.
4
Identify unaltered resin preservation
Amber entombment is matched to organisms trapped and preserved inside fossilized tree sap.
Resin hardens into an airtight amber matrix that shields delicate insects from microbial decomposition.

Key Concept

Modes of fossil preservation in paleontology and sedimentary stratigraphy
Estimated Time:1m 0s
Rate this question

Topics

Earth's History and Paleontology

More questions from this topic