Section 2. How this fits with Sec, I JR does not show, says that Base is top of "major conc zone above double layer near bottom of T.L." There are 2 such major conc zones know only that Concs to Unit 5 are prob. Crystallized byor 1) 11.4 Clayey Silt and sand, mottled with small concr. layer at top 2) 3.4 As in 1 with small "ironstone" conc layer at top. 3) 5.7 As in 1 with large concr. layer at top. 4) 1.2 Sandy silt, with thin (0.1+) layer sandy ten concret. at top, 5) 16.9 "Sandy". In top 5.0+ large grey sandy "ironstone" concs with grey SS jackets. Fossiliferous, Sphenodiscus , Phleopteria, [A-4651]