Fig 1.
A, map of the shore line cliff along the Avon River Estuary where Horton Bluff Formation strata are exposed (continuing into the intertidal zone); B, Oldest beds (Hurd Creek Member) at the base of the section showing the road termination on the beach; C, the cliff and intertidal zone at Lighthouse Point (Blue Beach Member), where the majority of tetrapod specimens were recovered.
Table 1.
List of Blue Beach specimens examined in the present study.
Fig 2.
The resistant beds here include especially productive sandstones known informally as the ‘Theta Layer’ (Theta) and ‘Lighthouse Sandstone’ (LHSS).
Fig 3.
A-F, YPM PU 23545, right humerus in A, oblique posterior, B, dorsal, C, ventral, D, oblique ventral, E, proximal, and F, distal views. G, NSM007GF004.634, small left humerus in ventral view. Abbreviations: dp, deltopectoral crest; ecc, ectepicondyle; ef, entepicondylar foramen; lr, longitudinal ridge.
Fig 4.
NSM005GF045.037, right humerus in A, proximal, B, anterior, C, ventral, D, anterior, and E, dorsal views. Abbreviations: dp, deltopectoral crest; ef, entepicondylar foramen; lds, latissimus dorsi spike; md, m. deltoideus scar; mfu, m. flexor ulnaris scar; mer, m. extensor radialis scar; meu, m. extensor ulnaris scar; msl, m. supinator longus scar; rf, radial facet; sd, scapulhumeral depression; uf, ulnar facet.
Fig 5.
RM 20.6707, right humerus in A, oblique posterior, B, dorsal, C, ventral, and D, oblique posterior views. Abbreviations: dp, deltopectoral crest; ec, ectepicondyle; ef, entepicondylar foramen; ld, latissimus dorsi scar; rf, radial facet; sul, distal sulcus; uf, ulnar facet.
Fig 6.
YPM PU 20754, left humerus in A, dorsal; and B, ventral views, less areas still obscured by matrix. RM 20.6770 left? humerus in C, dorsal, and D, ventral, views. Abbreviations: dp, deltopectoral crest; ect, ectepicondyle; ef, entepicondylar foramen.
Fig 7.
NSM005GF045.005, left scapulocoracoid in A, lateral, and B, medial views. Reconstruction of full extent of this morphotype from multiple specimens in C, lateral, and D, medial views. Abbreviations: cf, coracoid foramina; gl, glenoid; sgb, supraglenoid buttress; sgf, supraglenoid foramen.
Fig 8.
YPM PU 23550, right femur in A, posterior, B, dorsal, C, anterior, and D, ventral, E, proximal, and F, distal views. Scale bar equals 10 mm. Abbreviations: ab, adductor blade; ac, adductor crest; ff, fibular facet; icf, intercondylar fossa; tf, tibial facet.
Fig 9.
Femur Type 2 and tibia Type 1.
NSM004GF045.034A-C, right and left femora (Type 2) and left tibia (Type 1) found in association. A-D, I, J, left femur in A, posterior, B, ventral, C, anterior, D, dorsal I, proximal, and J, distal views. E-H right femur in E, dorsal, F, anterior, G, ventral, and H, posterior views. Left tibia in K, flexor (ventral), and L, extensor (dorsal) views. Abbreviations: ab, adductor blade; ac, adductor crest; cr, thin anterior crest; ff, fibular facet; fo, fibular fossa; ft, fourth trochanter; icf, intercondylar fossa; it, internal trochanter; itf, intertrochanteric fossa; tf, tibial facet.
Fig 10.
NSM007GF004.629, left femur (reversed for comparison) in A, posterior, B, dorsal, C, anterior, and D, ventral views. Abbreviations: ab, adductor blade; ac, adductor crest.
Fig 11.
NSM005GF045.048-A, right femur in A, anterior, B, ventral, C, posterior, and D, dorsal views. Abbreviations: ab, adductor blade; ac, adductor crest; it, internal trochanter; itf, intertrochanteric fossa; popb, popliteal butress.
Table 2.
Principle measurements (in mm) of select femora from Blue Beach.
Fig 12.
NSM014GF036.003 (A) and NSM.014.GF.036.004 (B). Right tibiae each in anterior, flexor, posterior, and extensor views. Abbreviations: ap, anterior process; cc, cnemial crest.
Fig 13.
NSM005GF045.001, right pelvis in A, medial, and B, lateral views. Abbreviations: ap, anterior process; il, ilium; ish, ischium; ob, obturator foramen; pp, posterior process; pub, pubis; sac, sacral rib facet.
Fig 14.
NSM014GF036.001, left ilium in medial view. Abbreviations: ap, anterior process; pp, posterior process; rr, robust ridge; sac, sacral rib facet.
Fig 15.
NSM.014.GF.036.005, undescribed interclavicle found in situ in the Theta Layer sandstone below the lighthouse in 2002. The morphology is consistent with a whatcheeriid and with similar elements from Dora, Scotland.
Fig 16.
New outline drawings of humerus NMS 1993.56.21 (formerly NUZ 78.1.58) in the plane of the entepicondyle. A, ventral, and B, dorsal views.
Fig 17.
Associated material from Blue Beach.
NSM005GF045.034, the ‘Sherm Block’ (for collector Sherman Williams) of associated front and hind limb material.