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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 16, Problem 8SQ
Textbook Problem
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In which type of rock are you moor likely to find a fossil?

  1. a. basalt, a dark, fine-grained volcanic rock
  2. b. limestone, composed of sedimented calcium carbonate
  3. c. slate, a volcanically melted and cooled shale
  4. d. granite, which forms by crystallization of magma cooling below Earth’s surface

Summary Introduction

Introduction: Fossils are the traces and leftovers of organisms that lived during the ancient times. The majority of the fossils consist of teeth, seeds, shells, mineralized bones, and spores of the ancient organism. Also, the impression of the foot prints, burrows, nests, eggshells, trails, or feces can collectively contribute to the evidence of life during the ancient times.

Explanation of Solution

Reason for correct answer:

Fossilization process starts when an organism or its traces are enclosed by the mud, ash, or sediments. The groundwater then leaks into these remains in order to fill the gaps inside and around them. The water that contains the dissolved minerals will slowly restore the minerals in hard tissues and in bones. After that, they will crystallize inside cavities and impressions to form the entire structure. Due to the increased pressure, sediments will gradually accumulate on the top site and after many years, it will convert the mineralized remains into rock. Most of the fossils are present in layers of sedimentary rock.

Option b. is given as “limestone, composed of sedimented calcium carbonate”.

Most of the fossils are present in layers of sedimentary rock. A type of limestone called as fossiliferous limestone is made up of calcium carbonate like aragonite and mineral calcite, which are composed mostly of fossils. The fossils present in these rocks will be microscopic or macroscopic in size.

Hence, the correct answer is option b.

Reason for incorrect answer:

Option a. is given as “basalt, a dark, fine-grained volcanic rock”...

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