| Microfossils H Armstrong, M Brasier John Wiley & Sons, 2013 | 561 | 2013 |
| Arabia–Eurasia collision and the forcing of mid-Cenozoic global cooling MB Allen, HA Armstrong Palaeogeography, Palaeoclimatology, Palaeoecology 265 (1-2), 52-58, 2008 | 559 | 2008 |
| Microfossils MD Brasier, H Armstrong G. Allen & Unwin, 1980 | 504 | 1980 |
| Presence of the earliest vertebrate hard tissue in conodonts IJ Sansom, MP Smith, HA Armstrong, MM Smith Science 256 (5061), 1308-1311, 1992 | 223 | 1992 |
| Polar front shift and atmospheric CO2 during the glacial maximum of the Early Paleozoic Icehouse TRA Vandenbroucke, HA Armstrong, M Williams, F Paris, JA Zalasiewicz, ... Proceedings of the National Academy of Sciences 107 (34), 14983-14986, 2010 | 128 | 2010 |
| Conodonts from the Upper Ordovician–lower Silurian carbonate platform of North Greenland HA Armstrong Bulletin Grønlands Geologiske Undersøgelse 159, 1-151, 1990 | 126 | 1990 |
| Origin, sequence stratigraphy and depositional environment of an upper Ordovician (Hirnantian) deglacial black shale, Jordan HA Armstrong, BR Turner, IM Makhlouf, GP Weedon, M Williams, ... Palaeogeography, Palaeoclimatology, Palaeoecology 220 (3-4), 273-289, 2005 | 121 | 2005 |
| Black shale deposition in an Upper Ordovician–Silurian permanently stratified, peri-glacial basin, southern Jordan HA Armstrong, GD Abbott, BR Turner, IM Makhlouf, AB Muhammad, ... Palaeogeography, Palaeoclimatology, Palaeoecology 273 (3-4), 368-377, 2009 | 106 | 2009 |
| Epipelagic chitinozoan biotopes map a steep latitudinal temperature gradient for earliest Late Ordovician seas: implications for a cooling Late Ordovician climate TRA Vandenbroucke, HA Armstrong, M Williams, F Paris, K Sabbe, ... Palaeogeography, Palaeoclimatology, Palaeoecology 294 (3-4), 202-219, 2010 | 105 | 2010 |
| Glaciation and deglaciation of the Libyan Desert: the Late Ordovician record DP Le Heron, HA Armstrong, C Wilson, JP Howard, L Gindre Sedimentary Geology 223 (1-2), 100-125, 2010 | 87 | 2010 |
| Rare earth element geochemistry of upper Ordovician cherts from the Southern Uplands of Scotland AW Owen, HA Armstrong, JD Floyd Journal of the Geological Society 156 (1), 191-204, 1999 | 85 | 1999 |
| Climatic controls on late Pleistocene alluvial fans, Cyprus JV Waters, SJ Jones, HA Armstrong Geomorphology 115 (3-4), 228-251, 2010 | 83 | 2010 |
| Rare earth geochemistry of Arenig cherts from the Ballantrae Ophiolite and Leadhills Imbricate Zone, southern Scotland: implications for origin and significance to the … HA Armstrong, AW Owen, JD Floyd Journal of the Geological Society 156 (3), 549-560, 1999 | 79 | 1999 |
| Deep-sea sediments record the geophysiology of the late Ordovician glaciation HA Armstrong, AL Coe Journal of the Geological Society 154 (6), 929-934, 1997 | 78 | 1997 |
| Thermal effects on rare earth element and strontium isotope chemistry in single conodont elements HA Armstrong, DG Pearson, M Griselin Geochimica et Cosmochimica Acta 65 (3), 435-441, 2001 | 71 | 2001 |
| Ground‐truthing Late Ordovician climate models using the paleobiogeography of graptolites TRA Vandenbroucke, HA Armstrong, M Williams, JA Zalasiewicz, ... Paleoceanography 24 (4), 2009 | 68 | 2009 |
| High frequency eustatic sea-level changes during the Middle to early Late Ordovician of southern Jordan: Indirect evidence for a Darriwilian Ice Age in Gondwana BR Turner, HA Armstrong, CR Wilson, IM Makhlouf Sedimentary Geology 251, 34-48, 2012 | 67 | 2012 |
| The apparatus architecture of Panderodus and its implications for coniform conodont classification IJ Sansom, HA Armstrong, MP Smith Palaeontology 37 (4), 781-800, 1994 | 67 | 1994 |
| Late Ordovician (Ashgillian) glacial deposits in southern Jordan BR Turner, IM Makhlouf, HA Armstrong Sedimentary Geology 181 (1-2), 73-91, 2005 | 66 | 2005 |
| Terrane evolution of the paratectonic Caledonides of northern Britain HA Armstrong, AW Owen Journal of the Geological Society 158 (3), 475-486, 2001 | 61 | 2001 |
