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From Charles Lyell [16 January 1857]
Summary
Enumerates fossil mammals known in Secondary strata.
Lack of angiosperm plants in rocks older than Chalk is no reason to anticipate rarity of warm-blooded quadrupeds.
| Author: | Charles Lyell, 1st baronet |
| Addressee: | Charles Robert Darwin |
| Date: | [16 Jan 1857] |
| Classmark: | DAR 205.9: 394 |
| Letter no: | DCP-LETT-2039 |
