what are the three characteristics of a good index fossil?
155274
A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata.
300481
Index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment. A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time.
1165094
['state of matter (whether it is a solid, liquid or gas)', 'density.', 'temperature.', 'elasticity of the medium.']
76914
['Reliability.', 'Speed and Time.', 'Sensitivity.', 'Selectivity and discrimination.', 'Stability.', 'Simplicity.', 'Economy.', 'Adequateness.']
665057
Describe the Types of Fossils According to "Enchanted Learning," archaeologists use three main types of fossil: the true form fossil, trace fossil and mold fossil; a fourth type is the cast fossil. Fossilization can take millions of years to occur.
599210
['Tenacity: 5 – 7 gm/den.', 'Elongation at break: 15 – 30%', 'Elastic modulus: 90.', 'Elasticity: Good.', 'Moisture Regain (MR%): 0.40%', 'Specific Gravity: 1.38.', 'Melting point: 2500C.', 'Volumetric Swelling: None.']
1077685
['Sound Forecasting.', 'An Adequate, Planned and Reliable Accounting System.', 'Efficient Organisation.', 'Formation of Budget Committee.', 'Cleanly defined Business Policies.', 'Availability of Standard Information.', 'Support of Top Management.', 'Good Reporting System.']
118590
Physical Characteristics of Rocks - Cleavage, Streak, Hardness, Fracture, Luster.
224631
['Strong, predictable operating cash flows with which the leveraged company can service and pay down acquisition debt.', 'Mature, steady (non-cyclical), and perhaps even boring.', 'Well-established business and products and leading industry position.']
958782
['Bedding. Bedding is often the most obvious feature of a sedimentary rock and consists of lines called bedding planes, which mark the boundaries of different layers of sediment. ... ', 'Graded beds are common when a sediment is being deposited by a slow‐moving current. ... ', 'Fossils. ... ', 'Desiccation cracks and ripple marks.']
361149
The organism generally must have hard parts such as shell, bone, teeth, or wood tissue; the remains must escape destruction after death; and the remains must be buried rapidly to stop decomposition. This does make the fossil record biased because animals with soft bodies are less likely to form fossils.
930730
["Location: Position on the Earth's Surface.", 'Place: Physical and Human Characteristics.', 'Human/Environment Interactions: Shaping the Landscape.', 'Movement: Humans Interacting on the Earth.', 'Regions: How They Form and Change.']
93153
['6 Characteristics for Rocks And Minerals! There are 6 types of characteristics for rocks and minerals. ... ', 'Hardness. The mohs hardness scale.', 'Lustre. The lustre comparison.', 'Colour. This is a comparison of different colours of the minerals.', 'Crystal Structure. ... ', 'Streak. ... ', 'Cleavage and Fracture.']
1428144
['Hard hat. ... ', 'Safety glasses. ... ', 'Gloves to protect your hands.', 'Hammer. ... ', 'One or two chisels, preferably one large and one small.', 'Backpack or cloth bag in which to carry the fossils.', 'Old newspapers or a roll of tissue paper for protecting fragile specimens.', 'Magnifying glass or hand lens, 3× to 10× power.']
819705
['Physiognomy: ... ', 'Growth-forms and life-forms: ... ', 'Phenology, periodicity or aspection: ... ', 'Stratification: ... ', 'Species abundance and species diversity: ... ', 'Sociability: ... ', 'Vitality: ... ', 'Disseminule type:']
233640
Most trace fossils can be placed into three general categories: tracks and trails, burrows and borings, and gastroliths and coprolites. Each of these types of trace fossils helps decipher the activities of past life.
898606
['Characteristic # 1. Reliability:', 'Characteristic # 2. Validity:', 'Characteristic # 3. Objectivity:', 'Characteristic # 4. Usability:']