Chapter 2

Chock full of data, the chapter is really in two parts:

1. Review of hydrodynamics (which you usually get in Sed/Strat).
2. A group-by-group review of the literature

Let's start with
Part I: hydrodynamics:

Figure 2.3 is a classic diagram that you'll find in every sedimentology textbook (Silent j, the name is pronounced HUL-strom in an American accent). It basically relates the size of sedimentary particles to the velocities required to move them. So, for example, a 1 mm diameter particle will be picked up (eroded) at velocities above 20 cm/s, and transported as long as the velocity remains above about 7 cm/sec. It will settle out (deposition) at velocities less than that. HOWEVER, we learn later in the chapter, especially in the section about microfossils, that the density of the particle (ie, shell) and shape will affect its hydrodynamic properties.

Unlike the previous chapter, the diagrams in the hydrodynamic section are for the most part self-explanatory and clear, probably because they describe idealized behavior of an idealized sphere. However, once we start talking about the behavior of fossils, things get messier---

I like fig. 2.7, but let's skip Fig. 2.8.

What conclusions can we draw from Fig. 2.9?

Part II: the group-by-group taphonomy summary
Well. As you start reading this section, trying not to get bogged down in specifics, a pattern starts to emerge.....that for every conclusion there is an equal and opposite conclusion by another researcher. By the end of the section I was left with the impression that it's a miracle taphonomy has emerged as an area of viable research!

Your thoughts and questions?