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3. When did the 5 drastic declines occur in Sepkoski's diversity curve (Figure 1)? Drastic decline 1: Drastic decline 2: Drastic decline 3: Drastic decline 4: Drastic decline 5: 4. Which of the drastic declines is reflected in all three faunas?

3. When did the 5 drastic declines occur in Sepkoski's diversity curve (Figure 1)? Drastic decline 1: Drastic decline 2: Drastic decline 3: Drastic decline 4: Drastic decline 5: 4. Which of the drastic declines is reflected in all three faunas?

Applications and Investigations in Earth Science (9th Edition)
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
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### Analysis of Diversity in Genera Over Geological Time The provided graph illustrates the changes in the number of genera over geological time, measured in millions of years (10^6 years). The horizontal axis represents geologic time, starting from 600 million years ago to the present. The vertical axis indicates the number of genera, ranging from 0 to 2500. #### Key Components of the Graph: 1. **Time Periods:** - Shown at the bottom of the graph are various geological periods abbreviated as: - Cm (Cambrian) - O (Ordovician) - S (Silurian) - D (Devonian) - C (Carboniferous) - P (Permian) - Tr (Triassic) - J (Jurassic) - K (Cretaceous) - T (Tertiary) 2. **Genera Diversity:** - The graph shows an overall increasing trend in the number of genera, with fluctuations occurring during different periods. - A noticeable decline can be observed at the boundary of the Permian period (P) and the Triassic period (Tr), indicating a significant extinction event. 3. **Highlighted Features:** - **Archaeocyathids:** Marked in the early Cambrian period, indicating their presence during this time. - **Microfossils:** Noted throughout the timeline, showcasing their continuous presence and diversity. - **Md (Modern fauna):** The recent, notable increase in genera numbers, particularly in modern faunal groups. 4. **Shaded Areas:** - **Pz (Paleozoic Era):** A yellow-shaded area highlighting genera diversity during the Paleozoic era. - The deeper green area represents the diversity of other faunal groups throughout the timeline. This graph provides a visual representation of the biodiversity trends across geological time, emphasizing key extinction events and periods of diversification.
Transcribed Image Text:### Analysis of Diversity in Genera Over Geological Time The provided graph illustrates the changes in the number of genera over geological time, measured in millions of years (10^6 years). The horizontal axis represents geologic time, starting from 600 million years ago to the present. The vertical axis indicates the number of genera, ranging from 0 to 2500. #### Key Components of the Graph: 1. **Time Periods:** - Shown at the bottom of the graph are various geological periods abbreviated as: - Cm (Cambrian) - O (Ordovician) - S (Silurian) - D (Devonian) - C (Carboniferous) - P (Permian) - Tr (Triassic) - J (Jurassic) - K (Cretaceous) - T (Tertiary) 2. **Genera Diversity:** - The graph shows an overall increasing trend in the number of genera, with fluctuations occurring during different periods. - A noticeable decline can be observed at the boundary of the Permian period (P) and the Triassic period (Tr), indicating a significant extinction event. 3. **Highlighted Features:** - **Archaeocyathids:** Marked in the early Cambrian period, indicating their presence during this time. - **Microfossils:** Noted throughout the timeline, showcasing their continuous presence and diversity. - **Md (Modern fauna):** The recent, notable increase in genera numbers, particularly in modern faunal groups. 4. **Shaded Areas:** - **Pz (Paleozoic Era):** A yellow-shaded area highlighting genera diversity during the Paleozoic era. - The deeper green area represents the diversity of other faunal groups throughout the timeline. This graph provides a visual representation of the biodiversity trends across geological time, emphasizing key extinction events and periods of diversification.
**3. When did the 5 drastic declines occur in Sepkoski’s diversity curve (Figure 1)?** - **Drastic decline 1:** - **Drastic decline 2:** - **Drastic decline 3:** - **Drastic decline 4:** - **Drastic decline 5:** **4. Which of the drastic declines is reflected in all three faunas?** *(Note: Figure 1 is not provided. Explanation or description of any graphs or diagrams would require visual reference.)*
Transcribed Image Text:**3. When did the 5 drastic declines occur in Sepkoski’s diversity curve (Figure 1)?** - **Drastic decline 1:** - **Drastic decline 2:** - **Drastic decline 3:** - **Drastic decline 4:** - **Drastic decline 5:** **4. Which of the drastic declines is reflected in all three faunas?** *(Note: Figure 1 is not provided. Explanation or description of any graphs or diagrams would require visual reference.)*
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