Figure 3
From: Animal–substrate interactions preserved in ancient lagoonal chalk
Representative photographs of trace fossils from the main lagoonal deposits: (a) and (b) show basal views of sparse Thalassinoides isp. [Th] in brackish-water lagoonal facies (WF1; BI = 2), DR16 locality; (c) cross-sectional core view showing the transition (base to top) from an oxygen-depleted subfacies (CF2b) to a more oxygenated deposit (CF2c) of a semi-restricted lagoonal setting; see the upward-increase in both bioturbation degree and the size of the deep-tier Chondrites isp. [Ch], “Shanklin, W.R.2” core; (d) cross-sectional view of highly bioturbated facies (WF2) in slightly restricted lagoonal subenvironment (BI = 4–5), DR16 locality; (e) basal view of moderately bioturbated deposits showing poorly preserved Thalassinoides isp. in a slightly restricted lagoonal facies (WF4b, BI = 4), DR33-B locality; (f) and (g) extremely bioturbated (BI = 6), nearly open lagoonal facies (CF4b) displaying by three-dimensional networks assigned to Thalassinoides isp., accompanied by minor ?Conichnus isp. [Co], A-1 locality.
