Location of MNA Loc. 1776 in the State of Utah
Figure 1: Location of MNA Loc. 1776 in the State of Utah. Tan area indicates Bears Ears region.
Generalized geologic map of MNA Loc. 1776
Figure 2: Generalized geologic map of MNA Loc. 1776, which is located in the ‘Bread Bowl’ area (small dashed line). Dashed and dotted line indicates the ridgeline of Comb Ridge. Trcmb, Monitor Butte Member, Chinle Formation; Trccr, Church Rock Member, Chinle Formation; TrJw, Wingate Sandstone; Jk, Kayenta Formation; Jn, Navajo Sandstone; Qa; Alluvium; Qc; Colluvium. Scale bar = 0.1 km, north is to top of image.
Area in which MNA V10984 and V10985 were discovered
Figure 3: A) Photograph of Bread Bowl area with ledge forming units visible. BIRB; “Big Indian Rock beds”; CL; coquina layer; LLFU; lower ledge-forming unit; TrM, Moenkopi Formation, TrCcr, Church Rock Member, Chinle Formation; TrJW, Wingate Sandstone; Qa; Alluvium. B) generalized stratigraphic column of the same area. C) Vertebrate burrows in the lower ledge forming unit.
MNA V10984 and outline of track
Figure 4: A) MNA V10984, Grallator trace and mudcracks. B) MNA V10984, Grallator trace (outlined) with mudcracks. Dashed lines indicates where DII was present when discovered and the approximate presumed extent of DIV.
Overview of MNA V10985
Figure 5: A) MNA V10985. B) MNA V10985 with tracks outlined. M1, manus print 1; M2, manus print 2; P1, pes print 1; P2, pes print 2.
Close up of Pes 1, MNA V10985
Figure 6: A) Close-up of P1, MNA V10985. B) Close-up of P1, MNA V10985 with the trace outlined. Scale bar = 1 cm.
Close up of Manus 1, MNA V10985
Figure 7: A) Close-up of M1, MNA V10985. B) Close up of M1 with the track and features outlined, MNA V10985. Scale bar = 1 cm.
Close up of Manus 2, MNA V10985
Figure 8: A) Close up of M2, MNA V10985. B) Close of M2 with track outlined, MNA V10985. Scale bar = 1 cm.
Pes of MNA V10985 compared to Brachychirotherium
Figure 9: A comparison between an aetosaur/Brachycheirotherium pes track (modified from Heckert et al., 2010) (A) and P1 of MNA V10985 (B). Scale bar 1 = cm for each track.