TABLE 1. Miocene localities, stratigraphy, local faunas and proboscideans from the Texas Coastal Plain.
| Locality | Stratigraphy | Local Fauna | NALMA | Taxon |
| TMM 40081 | Oakville Formation? | unnamed | He? | Proboscidean |
| TMM 40622 | Lower Lagarto Formation | Belts Creek L.F. | Ba1 | Gomphotherium cf. Gomphotherium inopinatum |
| TMM 40775 (TAM 19) |
Lower Lagarto Formation | Noble Farm L.F. | Ba1 | Gomphotherium sp. |
| TMM40418 | Lower Lagarto Formation | Brenham L.F. | Ba1 | Gomphotherium sp. |
| TMM 31219 | Upper Lagarto Formation | Cold Spring L.F. Donahoe Farm locality |
Ba2 | Gomphotherium sp. |
| TMM 31191 | Upper Lagarto Formation | Cold Spring L.F. Sam Houston locality |
Ba2 | Gomphotherium sp. |
| TAM 38 | Upper Lagarto Formation | Cold Spring L.F. | Ba2 | Gomphotherium sp. |
| TMM 31272 | Upper Lagarto Formation | Chappell Hill L.F. | Ba2 | Gomphotherium sp. |
| TMM 30936 | Lower Goliad Formation | Ten Mile Waterhole Creek L.F. | Cl1 | cf. Gomphotherium sp. |
| TMM 31170, TMM 31132 | Lower Goliad Formation | Bridge Ranch L.F. | Cl1 | cf. Gomphotherium sp. |
| TMM 30896 | Lower Goliad Formation | Buckner Ranch L.F. | CL2 | Blancotherium buckneri |
TABLE 2. TxVP specimen numbers (TMM), Texas A&M museum numbers (TAM), figure and plate numbers from Hay (1925), and element identification.
| TMM # | TAM # | Hay (1925) Figure | Element |
| TMM 40775-2129.1 | TAM 2129A | plate 3.2 | LDp2 |
| TMM 40775-2129.2 | TAM 2129B | plate 3.3 | RDp2 |
| TMM 40775-49 | TAM 2121E | plate 3.4 | RM2 |
| TMM 40775-47 | TAM 2121C | plate 3.5 | RM3 |
| TMM 40775-46 | TAM 2121B | plate 3.6 | Lm3 |
| TMM 40775-50.1 | TAM 2121F | plate 4.1, 4.2 | LDp4 |
| TMM 40775-50.2 | TAM 2121F | - | RDp4 |
| TMM 40775-2121 | TAM 2121, 2121A, 2213 | figs. 4 and 5 | Upper right tusk fragments with partial cranial fragments |
| TMM 40775-48.1 | TAM 2121D | plate 4.5 | Juvenile lower tusk |
| TMM 40775-48.2 | TAM 2121D | plate 4.5, 4.6 | Juvenile lower tusk |
| TMM 40775-51 | TAM 2121F | plate 4.4, fig. 9 | Partial mandible with R tusk fragment, L tusk alveolus |
| TMM 40775-52 | TAM 2213C | - | Upper tusk fragment |
| TMM 40775-53 | TAM 2213D | - | Upper tusk fragment |
| TMM 40775-54 | TAM 2213E | - | Upper tusk fragment |
| TMM 40775-55 | TAM 2213F | - | Upper tusk fragment |
| TMM 40775-56 | TAM 2213G | - | L i2 fragment, belongs with TMM 40775-51 |
| TMM 40775-57 | TAM 2213H | - | Upper tusk fragment |
| TMM 40775-58 | TAM 2213J | - | Upper tusk fragment |
| TMM 40775-59 | TAM 2213I, P | - | Upper tusk fragment |
| TMM 40775-60 | No number | - | Upper tusk fragment |
| TMM 40775-61 | No number | - | P/p2? |
TABLE 3. Measurements in cm for a series of cranial features comparing Gomphotherium angustidens (SEP185, age class XXI) (Tassy, 2013) and Gomphotherium sp. (TMM 31219-237) from the Cold Spring L.F. Features are based on the descriptions and illustration provided by Tassy (2013).
| Element description | Gomphotherium angustidens |
Gomphotherium sp. |
Element number |
| Length of skull, condyles to premaxillae | 72.2 | ~69 | 12 |
| Maximum length of zygomatic arch | 34.3 | ~30 | 13 |
| Length of the orbito-temporal fossa | 18 | 22 | 14 |
| Length of the basicranium | 21 | 26 | 16 |
| AP thickness of anterior zygomaticus | 11.7 | 9 | 17 |
| Maximum skull width at the zygomatic arches | 39 | 49.5 | 18 |
| Width of the basicranium | 30 | 38.4 | 19 |
| Maximum width choana | 4.9 | 6.8 | 20 |
| Maximum internal width of palate | 7.5 | 8.1 | 21 |
| Maximum external width of palate | 16 | 18.2 | 22 |
