rise in the te, contrilnsterd to the ofnyn first in the ocean annl later in the

Question

rise in the te, contrilnsterd to the ofnyn first in the ocean annl later in the a ce of these wicro- to Eastls 3.5 billion ye our planet. Fossil evicdence for the ex pie bacteria incukes distincthely lavered mats, calk Earth's First Life: Prokaryotes nensurthess oflore or hw hle originated, it is clear thhat Whuat is kxwn about these ancient fossils commes mainly hnto Inwohed change (Pgure from thhe stuwly of moxdern stromatolites like those found in kaxwn onganismus were singke single -ell Shark Bo: Australia Figure 22.218). Today's stromatuolites l onganisns, akng with trapped sexliments (Figure 22.21A) like stubby pillars built as microbes slowly move upward t 22.201 The first kwm EYE ON EARTH 22.2 he rocks shown here are Cambrian-age strom atoltes of the Hoyt Limestone, exposed at Lester Park, near Saratoga Springs, New York. QUESTION 1 Using Figure 22.3, determine approximately how many years ago these rocks were QUESTION 3 What was the environment like in this part of New York when these rocks were deposited? QUESTION 2 What is the name of the organisms that lkely produced these limestone deposis

Explanation / Answer

The rocks were from Cambrian age. The age will be 540 to 490 million years ago. The group of organisms which produced these are invertebrates. The environment was like the climate being changing from cold to warm and shallow sea water formed due increased coastal area and flooding.

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