In general, why are cephalopods and planktonic foraminifera likely to be less useful than bryozoa in bathymetric analyses? What general statement can be made about the paleobathymetry of a stratum containing abundant crinoids (see Fig. 12.10)? Note that the neritic-benthic environment (littoral-sublittoral zone) contains greater numbers and diversity of organisms. What factors may account for this?
In general, why are cephalopods and planktonic foraminifera likely to be less useful than bryozoa in bathymetric analyses? What general statement can be made about the paleobathymetry of a stratum containing abundant crinoids (see Fig. 12.10)? Note that the neritic-benthic environment (littoral-sublittoral zone) contains greater numbers and diversity of organisms. What factors may account for this?
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
Related questions
Question
- In general, why are cephalopods and planktonic foraminifera likely to be less useful than bryozoa in bathymetric analyses?
- What general statement can be made about the paleobathymetry of a stratum containing abundant crinoids (see Fig. 12.10)?
- Note that the neritic-benthic environment (littoral-sublittoral zone) contains greater numbers and diversity of organisms. What factors may account for this?
Figure 12.10 General depth distribution of some of the groups of marine fossil and living invertebrates
Transcribed Image Text:High tide
-Littoral zone
Intertidal zone
Echinoids
Low tide
Calcareous algae
Calcareous sponges
Reef corals-
Crinoids
Blastoids
Sublittoral zone
Stelleroids
Holothuroids
Bryozoa
-Inarticulate brachiopods
Articulate brachiopods
200m
Trilobite
Cephalopods
-- Gastropods
Pelecypods
Bathyal zone
Abyssal
Siliceous sponges
Abundant
Sea level
zone
Rare to common
Depth in
meters
50
200
400
600
800
1000
1200
1400
1600
1800
2000
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